Do not allow intersphinx mappings unless :external: role is used - add this role to rstcheck linting

Author: benjaoming

docs/.rstcheck.cfg

@@ -1,6 +1,6 @@
 [rstcheck]
 ignore_directives=automodule,http:get,tabs,tab,prompt,http:patch,http:post,http:put,http:delete
-ignore_roles=djangosetting,setting,featureflags,buildpyversions
+ignore_roles=djangosetting,setting,featureflags,buildpyversions,external+rtd:doc,external,external+rtd
 ignore_substitutions=org_brand,com_brand,:smile:,:arrows_counterclockwise:,:heavy_plus_sign:,:tada:,:heart:,:pencil2:
 # This error needs to be ignored for now
 # See: https://github.com/myint/rstcheck/issues/19

docs/conf.py

@@ -94,6 +94,9 @@
     "rtd": ("https://docs.readthedocs.io/en/stable/", None),
     "rtd-dev": ("https://dev.readthedocs.io/en/latest/", None),
 }
+# Redundant in Sphinx 5.0
+# https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html#confval-intersphinx_disabled_reftypes
+intersphinx_disabled_reftypes = ["std:doc"]
 myst_enable_extensions = [
     "deflist",
 ]

docs/dev/contribute.rst

@@ -90,6 +90,8 @@ projects, feel free to suggest the language on Transifex to start the process.
 Triaging issues
 ---------------
 
+.. rstcheck: ignore-roles="external+rtd:doc"
+
 Everyone is encouraged to help improving, refining, verifying and prioritizing
 issues on Github. The Read the Docs core :external+rtd:doc:`team` uses the following
 guidelines for issue triage on all of our projects. These guidelines describe