docs: Move some documentation into a subfolder

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-Contributing
-============
-
-License
--------
-
-`bfs` is licensed under the [Zero-Clause BSD License](https://opensource.org/licenses/0BSD), a maximally permissive license.
-Contributions must use the same license.
-
-
-Building
---------
-
-`bfs` uses [GNU Make](https://www.gnu.org/software/make/) as its build system.
-A simple invocation of
-
-    $ make
-
-should build `bfs` successfully, with no additional steps necessary.
-As usual with `make`, you can run a [parallel build](https://www.gnu.org/software/make/manual/html_node/Parallel.html) with `-j`.
-For example, to use all your cores, run `make -j$(nproc)`.
-
-### Targets
-
-| Command          | Description                                                   |
-|------------------|---------------------------------------------------------------|
-| `make`           | Builds just the `bfs` binary                                  |
-| `make all`       | Builds everything, including the tests (but doesn't run them) |
-| `make check`     | Builds everything, and runs the tests                         |
-| `make install`   | Installs `bfs` (with man page, shell completions, etc.)       |
-| `make uninstall` | Uninstalls `bfs`                                              |
-
-### Flag-like targets
-
-The build system provides a few shorthand targets for handy configurations:
-
-| Command        | Description                                                 |
-|----------------|-------------------------------------------------------------|
-| `make release` | Build `bfs` with optimizations, LTO, and without assertions |
-| `make asan`    | Enable [AddressSanitizer]                                   |
-| `make lsan`    | Enable [LeakSanitizer]                                      |
-| `make msan`    | Enable [MemorySanitizer]                                    |
-| `make tsan`    | Enable [ThreadSanitizer]                                    |
-| `make ubsan`   | Enable [UndefinedBehaviorSanitizer]                         |
-| `make gcov`    | Enable [code coverage]                                      |
-
-[AddressSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizer
-[LeakSanitizer]: https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer#stand-alone-mode
-[MemorySanitizer]: https://github.com/google/sanitizers/wiki/MemorySanitizer
-[ThreadSanitizer]: https://github.com/google/sanitizers/wiki/ThreadSanitizerCppManual
-[UndefinedBehaviorSanitizer]: https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html
-[code coverage]: https://gcc.gnu.org/onlinedocs/gcc/Gcov.html
-
-You can combine multiple flags and other targets (e.g. `make asan ubsan check`), but not all of them will work together.
-
-### Flags
-
-Other flags are controlled with `make` variables and/or environment variables.
-Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
-
-| Flag                             | Description                                 |
-|----------------------------------|---------------------------------------------|
-| `CC`                             | The C compiler to use, e.g. `make CC=clang` |
-| `CFLAGS`<br>`EXTRA_CFLAGS`       | Override/add to the default compiler flags  |
-| `LDFLAGS`<br>`EXTRA_LDFLAGS`     | Override/add to the linker flags            |
-| `WITH_ACL`<br>`WITH_ATTR`<br>... | Enable/disable optional dependencies        |
-| `TEST_FLAGS`                     | `tests.sh` flags for `make check`           |
-| `DESTDIR`                        | The root directory for `make install`       |
-| `PREFIX`                         | The installation prefix (default: `/usr`)   |
-| `MANDIR`                         | The man page installation directory         |
-
-### Dependency tracking
-
-The build system automatically tracks header dependencies with the `-M` family of compiler options (see `DEPFLAGS` in the `Makefile`).
-So if you edit a header file, `make` will rebuild the necessary object files ensuring they don't go out of sync.
-
-We go one step further than most build systems by tracking the flags that were used for the previous compilation.
-That means you can change configurations without having to `make clean`.
-For example,
-
-    $ make
-    $ make release
-
-will build the project in debug mode and then rebuild it in release mode.
-
-A side effect of this may be surprising: `make check` by itself will rebuild the project in the default configuration.
-To test a different configuration, you'll have to repeat it (e.g. `make release check`).
-
-
-Testing
--------
-
-`bfs` comes with an extensive testsuite which can be run with
-
-    $ make check
-
-Most of the testsuite is implemented in the file [`tests.sh`](/tests.sh).
-This script contains hundreds of separate test cases.
-Most of them are *snapshot tests* which compare `bfs`'s output to a known-good copy saved under [`tests`](/tests).
-
-You can pass the name of a particular test case (or a few) to run just those tests.
-For example:
-
-    $ ./tests.sh test_basic
-
-If you need to update the reference snapshot, pass `--update`.
-It can be handy to generate the snapshot with a different `find` implementation to ensure the output is correct, for example:
-
-    $ ./tests.sh test_basic --bfs=find --update
-
-But keep in mind, other `find` implementations may not be correct.
-To my knowledge, no other implementation passes even the POSIX-compatible subset of the tests:
-
-    $ ./tests.sh --bfs=find --posix
-    ...
-    tests passed: 89
-    tests failed: 5
-
-Run
-
-    $ ./tests.sh --help
-
-for more details.
-
-### Validation
-
-A more thorough testsuite is run by the [CI](https://github.com/tavianator/bfs/actions) and to validate releases.
-It builds `bfs` in multiple configurations to test for latent bugs, memory leaks, 32-bit compatibility, etc.
-You can run it yourself with
-
-    $ make distcheck
-
-Some of these tests require `sudo`, and will prompt for your password if necessary.
-
-
-Hacking
--------
-
-`bfs` is written in [C](https://en.wikipedia.org/wiki/C_(programming_language)), specifically [C11](https://en.wikipedia.org/wiki/C11_(C_standard_revision)).
-You can get a feel for the coding style by skimming the source code.
-[`main.c`](src/main.c) contains an overview of the rest of source files.
-A quick summary:
-
-- Tabs for indentation, spaces for alignment.
-- Most types and functions should be namespaced with `bfs_`.
-  Exceptions are made for things that could be generally useful outside of `bfs`.
-- Error handling follows the C standard library conventions: return a nonzero `int` or a `NULL` pointer, with the error code in `errno`.
-  All failure cases should be handled, including `malloc()` failures.
-- `goto` is not harmful for cleaning up in error paths.
-
-### Adding tests
-
-Both new features and bug fixes should have associated tests.
-To add a test, create a new function in `tests.sh` called `test_<something>`.
-Snapshot tests use the `bfs_diff` function to automatically compare the generated and expected outputs.
-For example,
-
-```bash
-function test_something() {
-    bfs_diff basic -name something
-}
-```
-
-`basic` is one of the directory trees generated for test cases; others include `links`, `loops`, `deep`, and `rainbow`.
-
-Run `./tests.sh test_something --update` to generate the reference snapshot (and don't forget to `git add` it).
-Finally, add the test case to one of the arrays `posix_tests`, `bsd_tests`, `gnu_tests`, or `bfs_tests` depending on which `find` implementations it should be compatible with.