Use svg remixicons

[tvdeyen]

What is this pull request for?

Instead of a iconfont we use the svg icon sprite to render icons. This includes a new component <alchemy-icon> with name, size and icon-style props.

With https://github.com/rails/rails/pull/50359 being merged svgs will be precompressed during asset compilation, which makes a huge difference on transferred file size.

Notable changes

Removes the icon fonts and ri- classes for <i> elements.

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message
• [x] I have added tests to cover this change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.81%. Comparing base (63d5474) to head (7fb12a0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2749 +/- ## ======================================= Coverage 95.80% 95.81% ======================================= Files 221 222 +1 Lines 6078 6087 +9 ======================================= + Hits 5823 5832 +9 Misses 255 255 ```

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