mkdocs/mkdocs 1.3.0 on GitHub

ReadTheDocs theme updated from v0.4.1 to v1.0.0 according to upstream (#2585)
The most notable changes:
- New option logo: Rather than displaying the site_name in the title, one can specify a path to an image to display instead.
- New option anonymize_ip for Google Analytics.
- Dependencies were upgraded: jQuery upgraded to 3.6.0, Modernizr.js dropped, and others.
See documentation of config options for the theme
Built-in themes now also support these languages:
- German (#2633)
- Persian (Farsi) (#2787)
Support custom directories to watch when running mkdocs serve (#2642)
MkDocs by default watches the docs directory and the config file. Now there is a way to add more directories to watch for changes, either via the YAML watch key or the command line flag --watch.
Normally MkDocs never reaches into any other directories (so this feature shouldn't be necessary), but some plugins and extensions may do so.
See documentation.
New --no-history option for gh_deploy (#2594)
Allows to discard the history of commits when deploying, and instead replace it with one root commit

An XSS vulnerability when using the search function in built-in themes was fixed (#2791)
Setting the edit_uri option no longer erroneously adds a trailing slash to repo_url (#2733)

Breaking change: the pages config option that was deprecated for a very long time now causes an error when used (#2652)
To fix the error, just change from pages to nav.
Performance optimization: during startup of MkDocs, code and dependencies of other commands will not be imported (#2714)
The most visible effect of this is that dependencies of mkdocs serve will not be imported when mkdocs build is used.
Recursively validate nav (#2680)
Validation of the nested nav structure has been reworked to report errors early and reliably. Some edge cases have been declared invalid.

Other small improvements; see commit log.