Django-powerwiki

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Bugfix:

* Add missing default wiki logo

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Features:

* Archived wikis
* Global search, smarter wiki selection during search
* Redesigned index page with logo support for easier browsing

Changes:

* Documentation to Read The Docs
* Upgraded codemirror and configured tab to insert spaces
* Drop support for Django 2.2

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Features:

* In-document navigation sidebar (requires JavaScript)
* Enhanced search when using postgresql
* Ability to search multiple wikis at once
* New ``[[index:<path>]]`` tag
* Converts ``->`` into ``→``


Changes:

* New ``Page.depth`` value, requires migration
* Internal API: renamed ``WIKILINK_`` constants to ``TAG_``
* Removed support for Python <3.9 - may still work, no longer tested

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Bugfix:

* Relax path and asset validation rules

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Features:

* Add CodeMirror v5
* Add post-engine processing for ``[[..]]`` wiki links
* reStructuredText markup engine now supports ``:wiki:`` and ``:asset:`` roles for
slugification consistent with the rest of Powerwiki
* Missing pages and assets are styled differently


Changes:

* Removed support for Python <3.7


Bugfix:

* Emptying a page's contents will delete it
* Cross-wiki linking no longer leaks page paths
* Missing assets no longer cause errors

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Bugfix:

* Correct index template