[openstreetmap/openstreetmap-website] Inline SVGs with helper module (PR #5938)

[Marwin Hochfelsner]

### Description
Using a basic helper module, this PR resolves most of #5880. To fully conclude that:
- The changeset icons should be extracted too, but the definitions should also be put outside the list.
  #5884 aims to do part of this without the helper.
- The directions sprite could benefit from another method `InlineSvg.define` that is outside this PR's scope

### How has this been tested?
Verifying that the local Rails output matches

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5938

-- Commit Summary --

  * Add InlineSvg module
  * Inline search icons with helper
  * Inline about icons with helper
  * Inline welcome icons with helper
  * Inline more icons with helper

-- File Changes --

    A app/assets/icons/about/community.svg (4)
    A app/assets/icons/about/legal.svg (5)
    A app/assets/icons/about/local.svg (4)
    A app/assets/icons/about/open.svg (4)
    A app/assets/icons/about/partners.svg (5)
    A app/assets/icons/feed.svg (4)
    A app/assets/icons/new.svg (3)
    A app/assets/icons/search/bicycle.svg (3)
    A app/assets/icons/search/car.svg (3)
    A app/assets/icons/search/directions.svg (4)
    A app/assets/icons/search/foot.svg (3)
    A app/assets/icons/search/magnifying_glass.svg (8)
    A app/assets/icons/search/reverse_directions.svg (4)
    A app/assets/icons/welcome/check.svg (4)
    A app/assets/icons/welcome/cross.svg (4)
    A app/assets/icons/welcome/editor.svg (4)
    A app/assets/icons/welcome/node.svg (4)
    A app/assets/icons/welcome/question.svg (4)
    A app/assets/icons/welcome/rules.svg (4)
    A app/assets/icons/welcome/tag.svg (4)
    A app/assets/icons/welcome/way.svg (7)
    M app/views/diary_entries/index.html.erb (4)
    M app/views/layouts/_search.html.erb (31)
    M app/views/site/_any_questions.html.erb (5)
    M app/views/site/about.html.erb (33)
    M app/views/site/welcome.html.erb (38)
    M app/views/traces/index.html.erb (8)
    A lib/inline_svg.rb (13)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5938.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5938.diff

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