Add shortcut for creating links to issues and PRs in the documentation (#685)

* add shortcuts for referencing issues and PR

* add example use for :pr: directive

Author: behackl

docs/source/changelog.rst

@@ -20,6 +20,11 @@ Configuration
    Configuration tutorial for details.
 
 
+Documentation
+^^^^^^^^^^^^^
+
+#. Add ``:issue:`` and ``:pr:`` directives for simplifying linking to issues and
+   pull requests on GitHub (via :pr:`685`).
 
 
 Mobjects, Scenes, and Animations

docs/source/conf.py

@@ -56,6 +56,7 @@
     "sphinx.ext.napoleon",
     "sphinx.ext.autosummary",
     "sphinx.ext.doctest",
+    "sphinx.ext.extlinks",
     "sphinxext.opengraph",
     "manim_directive",
 ]
@@ -103,6 +104,12 @@
 # This specifies any additional css files that will override the theme's
 html_css_files = ["custom.css"]
 
+# external links
+extlinks = {
+    "issue": ("https://github.com/ManimCommunity/manim/issues/%s", "issue "),
+    "pr": ("https://github.com/ManimCommunity/manim/pull/%s", "pull request "),
+}
+
 # opengraph settings
 ogp_image = "https://www.manim.community/logo.png"
 ogp_site_name = "Manim Community | Documentation"