docs: Remove broken refs and duplicate module directive

why: Sphinx warned about undefined labels and duplicate module objects.

what:
- replace pytest fixture ref with direct link and drop redundant {module} directive in pytest-plugin
- switch vcspull ref to external link and remove unused footnote in url guide

Author: tony

docs/pytest-plugin.md

@@ -11,10 +11,6 @@ Looking for more flexibility, correctness, or power? Need different defaults? [C
 [connect with us]: https://github.com/vcs-python/libvcs/discussions
 ```
 
-```{module} libvcs.pytest_plugin
-
-```
-
 [pytest]: https://docs.pytest.org/
 
 ## Usage
@@ -29,7 +25,7 @@ Pytest will automatically detect the plugin, and its fixtures will be available.
 
 ## Fixtures
 
-This pytest plugin works by providing {ref}`pytest fixtures <pytest:fixtures-api>`. The plugin's fixtures ensure that a fresh Git, Subversion, or Mercurial repository is available for each test. It utilizes [session-scoped fixtures] to cache initial repositories, improving performance across tests.
+This pytest plugin works by providing [pytest fixtures](https://docs.pytest.org/en/stable/how-to/fixtures.html). The plugin's fixtures ensure that a fresh Git, Subversion, or Mercurial repository is available for each test. It utilizes [session-scoped fixtures] to cache initial repositories, improving performance across tests.
 
 [session-scoped fixtures]: https://docs.pytest.org/en/8.3.x/how-to/fixtures.html#fixture-scopes
 

docs/url/index.md

@@ -243,8 +243,9 @@ in {mod}`urlparse` (undocumented).
 
 From there, `GitURL` can be used downstream directly by other projects.
 
-In our case, `libvcs`s' own {ref}`cmd` and {ref}`projects`, as well as a {ref}`vcspull:index`
-configuration, will be able to detect and accept various URL patterns.
+In our case, `libvcs`s' own {ref}`cmd` and {ref}`projects`, as well as a
+[vcspull configuration](https://vcspull.git-pull.com/), will be able to detect and accept various
+URL patterns.
 
 ### Matchers: Defaults
 
@@ -255,10 +256,6 @@ When a match occurs, its `defaults` will fill in non-matched groups.
 When registering new matchers, higher `weight`s are checked first. If it's a valid regex grouping,
 it will be picked.
 
-[^api-unstable]: Provisional API only
-
-    It's not determined if Location will be mutable or if modifications will return a new object.
-
 ## Explore
 
 ```{toctree}