Tidy templates for documentation views.

[ngnpope]

For both Redoc & Swagger UI templates:

• Make spacing in {{ ... }} tags consistent.
• Make use of |default filter for default title.
• No need for self-closing tags in HTML5.
• Remove type="text/css" for <link rel="stylesheet" ...>
  • It's the implicit default since HTML5.

For Redoc template:

• Remove unnecessary comments or convert to Django template comments.
• Update to use newer method for loading fonts from Google.

For Swagger UI templates:

• Don't force type="image/png" for Swagger favicon
  • The setting might point to another type, e.g. SVG.
• Don't use the |safe filter unnecessarily, i.e. for script_url.
• Various minor JavaScript tweaks, e.g. missing trailing semicolons, etc.
• Align with styles from https://cdn.jsdelivr.net/npm/swagger-ui-dist@3.52.3/index.html

Split out from #544.

[codecov]

Codecov Report

Merging #556 (5313f45) into master (2c91cbd) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #556   +/-   ##
=======================================
  Coverage   98.76%   98.76%           
=======================================
  Files          58       58           
  Lines        6489     6489           
=======================================
  Hits         6409     6409           
  Misses         80       80           

Impacted Files	Coverage Δ
tests/test_view.py	100.00% <100.00%> (ø)

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[tfranzel]

@ngnpope excellent changes. learnt some new things today. thx. 😄

the preconnect makes total sense. never used it before. I would have never noticed the swagger ui default style html there. The visual difference is tiny but it's there.

[ngnpope]

Thanks.

the preconnect makes total sense. never used it before.

I only noticed from using Google Fonts for something else and this is the output they're providing! A small modernisation.

I would have never noticed the swagger ui default style html there. The visual difference is tiny but it's there.

Yes - the background color was something I'd noticed in particular.

[tfranzel]

@ngnpope fyi the removal of safe introduced a bug. the devil is in the details.... django does convert & to & which breaks urls when inside JS context. see commit message for details.