[openstreetmap/openstreetmap-website] CSS Cleanups (#3117)

[Andy Allan]

This PR contains a few CSS cleanups, removing some unnecessary CSS declarations, and also re-implementing #2717 with bootstrap utilities.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3117

-- Commit Summary --

  * Remove the old richtext_area helper
  * Remove final uses of the deemphasize class
  * Remove unnecessary margin-tops
  * Add a small margin before the changesets more button

-- File Changes --

    M app/assets/stylesheets/common.scss (17)
    M app/helpers/application_helper.rb (20)
    M app/views/browse/changeset.html.erb (2)
    M app/views/changesets/index.html.erb (2)
    M app/views/diary_entries/comments.html.erb (2)
    D app/views/site/_html_help.erb (0)
    D app/views/site/_markdown_help.html.erb (26)
    M app/views/users/account.html.erb (2)
    M config/locales/en.yml (17)
    M test/helpers/application_helper_test.rb (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3117.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3117.diff

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