docs(book): Fix broken internal links

When refering to `README.md` from anywhere outside the SUMMARY.md, it will not
correctly translate them into links to `index.html`, but refering to `index.md`
will. This also moves `./test-sets` directly into `./reference` and removes some
overly specific cli reference sections.

docs/book/src/README.md

@@ -25,8 +25,8 @@ After the quick start, a few guides delve deeper into some advanced topics.
 - [Setting Up CI](./guides/ci.md) shows how to set up `typst-test` to continuously test all changes to your package.
 
 The later sections of the book are a technical reference to `typst-test` and its various features or concepts.
-- [Tests](./reference/tests.md) outlines which types of tests `typst-test` supports, how they can be customized and which features are offered within the test scripts.
-- [Test Set Language](./reference/test-set-dsl.md) defines the test set language and its built in test sets.
+- [Tests](./reference/tests/index.md) outlines which types of tests `typst-test` supports, how they can be customized and which features are offered within the test scripts.
+- [Test Set Language](./reference/test-sets/index.md) defines the test set language and its built in test sets.
 - [Configuration Schema](./reference/config.md) lists all existing config options, their expected types and default values.
-- [Command Line Tool](./reference/cli.md) goes over `typst-test`s various sub commands, arguments and options.
+- [Command Line Tool](./reference/cli/index.md) goes over `typst-test`s various sub commands, arguments and options.
 

docs/book/src/SUMMARY.md

@@ -17,23 +17,12 @@
   - [Reference Kinds]()
   - [Annotations]()
   - [Directory Structure]()
-- [Test Set Language](./test-sets/README.md)
-  - [Grammar](./test-sets/grammar.md)
-  - [Built-in Test Sets](./test-sets/built-in.md)
+- [Test Set Language](./reference/test-sets/README.md)
+  - [Grammar](./reference/test-sets/grammar.md)
+  - [Built-in Test Sets](./reference/test-sets/built-in.md)
 - [Configuration Schema]()
   - [Template]()
   - [Hooks]()
 - [Command Line Tool]()
   - [Global Options]()
   - [Command Reference]()
-    - [init]()
-    - [uninit]()
-    - [status]()
-    - [list]()
-    - [compile]()
-    - [run]()
-    - [update]()
-    - [add]()
-    - [edit]()
-    - [remove]()
-    - [util]()

docs/book/src/guides/test-sets.md

@@ -38,7 +38,7 @@ Tying it all together, we can describe what this expression matches in a sentenc
 
 > Select all tests which are not marked ignore and are inside a module starting with `foo-`, include also the test `bar/baz`.
 
-Trying to describe this relationship using options on the command line would be cumbersome, error prone and, depending on the options present, impossible.
+Trying to describe this relationship using options on the command line would be cumbersome, error prone and, depending on the options present, impossible. [^ref]
 
 ## Default Test Sets
 Many operations take either a set of tests as positional arguments, which are matched exactly, or a test set expression.
@@ -99,3 +99,5 @@ Specifically the `all` and `none` test sets can be used as identity sets for cer
 
 Some of the syntax used in test sets may interfere with your shell, especially the use of whitespace.
 Use non-interpreting quotes around the test set expression (commonly single quotes `'...'`) to avoid interpreting them as shell specific sequences.
+
+[^ref]: To get a more complete look at test sets, take a look at the [reference](../reference/test-sets.md).