[openstreetmap/openstreetmap-website] Various font size changes (PR #3630)

[Andy Allan]

Now that we're on Bootstrap 5 we are using RFS, which implements responsive font sizes. Therefore it's worth refactoring places where we have font-sizes declared in our custom.css, particularly for headers, because these custom definitions are not responsive.

I've also refactored the about, welcome and fixthemap pages slightly, to change the headers used, use the bootstrap '[lead](https://getbootstrap.com/docs/5.1/content/typography/#lead)' paragraph styling, and move some more CSS into bootstrap utils.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3630

-- Commit Summary --

  * Remove unnecessary br tags
  * Fix the font weight on the about page title, and use lead styling for the lede
  * Use th tags on trace show table
  * Remove font size overrides from sidebar headings
  * Remove font size overrides for code and pre blocks
  * Rework welcome and fixthemap pages
  * Remove extra container div from fixthemap page

-- File Changes --

    M app/assets/stylesheets/common.scss (28)
    M app/views/site/about.html.erb (4)
    M app/views/site/fixthemap.html.erb (38)
    M app/views/site/welcome.html.erb (42)
    M app/views/traces/show.html.erb (18)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3630.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3630.diff

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