docs(packages): Add PyPI to Source on GitHub bottom links

why: Consistent with Package metadata section; users at bottom of page
     should also be able to reach PyPI without scrolling back up
what:
- Append " · [PyPI](url)" to the bottom link on all 7 package pages

Author: tony

docs/packages/gp-sphinx.md

@@ -55,4 +55,4 @@ for the exact coordinator call.
 ```{package-reference} gp-sphinx
 ```
 
-[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/gp-sphinx)
+[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/gp-sphinx) · [PyPI](https://pypi.org/project/gp-sphinx/)

docs/packages/sphinx-argparse-neo.md

@@ -112,4 +112,4 @@ Or reStructuredText:
 ```{package-reference} sphinx-argparse-neo
 ```
 
-[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-argparse-neo)
+[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-argparse-neo) · [PyPI](https://pypi.org/project/sphinx-argparse-neo/)

docs/packages/sphinx-autodoc-docutils.md

@@ -116,4 +116,4 @@ the live `setup()` calls.
 ```{package-reference} sphinx-autodoc-docutils
 ```
 
-[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-autodoc-docutils)
+[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-autodoc-docutils) · [PyPI](https://pypi.org/project/sphinx-autodoc-docutils/)

docs/packages/sphinx-autodoc-pytest-fixtures.md

@@ -91,4 +91,4 @@ pytest_external_fixture_links = {
 ```{package-reference} sphinx-autodoc-pytest-fixtures
 ```
 
-[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-autodoc-pytest-fixtures)
+[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-autodoc-pytest-fixtures) · [PyPI](https://pypi.org/project/sphinx-autodoc-pytest-fixtures/)

docs/packages/sphinx-autodoc-sphinx.md

@@ -76,4 +76,4 @@ surface from the live `setup()` calls.
 ```{package-reference} sphinx-autodoc-sphinx
 ```
 
-[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-autodoc-sphinx)
+[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-autodoc-sphinx) · [PyPI](https://pypi.org/project/sphinx-autodoc-sphinx/)

docs/packages/sphinx-fonts.md

@@ -81,4 +81,4 @@ The extension injects these values during `html-page-context`:
 ```{package-reference} sphinx-fonts
 ```
 
-[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-fonts)
+[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-fonts) · [PyPI](https://pypi.org/project/sphinx-fonts/)

docs/packages/sphinx-gptheme.md

@@ -81,4 +81,4 @@ icons, and the IBM Plex font stacks consumed by the theme templates.
 ```{package-reference} sphinx-gptheme
 ```
 
-[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-gptheme)
+[Source on GitHub](https://github.com/git-pull/gp-sphinx/tree/main/packages/sphinx-gptheme) · [PyPI](https://pypi.org/project/sphinx-gptheme/)