SEO Compatible Rendering

[Archmonger]

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Description

• SEO compatible rendering
  • Prerenders the initial component via the template tag using vdom_to_html, then loads the actual component in the background within a hidden div. When loaded, the prerender is replaced with the actual render.
  • settings.py:REACTPY_PRERENDER can be set to True to enable this behavior by default
  • Enable it on individual components via the template tag: {% component "..." prerender="True" %}
• Docs styling, verbiage, and formatting tweaks
• Rename undocumented utility function reactpy_django.utils.ComponentPreloader to reactpy_django.utils.RootComponentFinder.
• Fix JavaScript being via pip install -e . on Windows.
• Update PyPi package metadata
• Update pull request template

Checklist:

Please update this checklist as you complete each item:

• [x] Tests have been included for all bug fixes or added functionality.
• [x] The changelog has been updated with any significant changes, if necessary.
• [x] GitHub Issues which may be closed by this PR have been linked.

[Archmonger]

@rmorshea BTW after a lot of testing, the most rational approach for this was to prerender in a separate div, then replace it with the actual render when possible. The prerendering step is performed entirely by the template tag.

Saves us from cross-process rehydration headaches, and is the most compatible solution across multiple backends.