update project files (#5457)

* update pre-commit hook
* upgrade pip with venv
* update description and version
* show url in publish environment
* update versions
* update versions, separate typing job
* use dependabot grouped updates
  ignore upload/download-artifact until slsa updates
* use sphinx.ext.extlinks instead of sphinx-issues
* update dev dependencies
* update editorconfig
* update gitignore
* update .readthedocs.yaml
* license is txt, readme is md
* update pyproject.toml
  add typed classifier
  add pyright config
  simplify urls
* tox builds docs in place
* update min test py version
* add tox env to update all dev dependencies
* update issue and pr templates
* rename security docs page to not conflict with org policy file
* simplify matrix

.github/ISSUE_TEMPLATE/bug-report.md

@@ -5,7 +5,7 @@ about: Report a bug in Flask (not other projects which depend on Flask)
 
 <!--
 This issue tracker is a tool to address bugs in Flask itself. Please use
-Pallets Discord or Stack Overflow for questions about your own code.
+GitHub Discussions or the Pallets Discord for questions about your own code.
 
 Replace this comment with a clear outline of what the bug is.
 -->