fix: Update paths for webmanifest and add svg.

[froboy]

https://yusa.atlassian.net/browse/DS-1287

Checker failed a couple places. Cleaning those up. I think that’s as good as we’re going to be able to do.

• the hardcoded paths won’t work for the builds as they’re in subdomains, but they will work in most other sites.
• browserconfig.xml isn’t detected at the root path, but I’ve added an entry which should get rewritten with the configured path so it’s found.
• I added an SVG favicon which is now supported as well.

Steps for review

• Check at https://realfavicongenerator.net/favicon_checker

General checks

• All coding styles are fulfilled and there are no any issues reported by CodeSniffer. See Code of Conduct.
• Try to use Conventional commit messages accordingly to the standard https://www.conventionalcommits.org/en/v1.0.0/#specification
• Documentation has been updated according to PR changes.
• Steps for review have been provided according to PR changes.
  
• Make sure you've provided all necessary hook_update_N to support upgrade path.
• Make sure your git email is associated with an account on drupal.org, otherwise, you won't get commits there.
  
• If you would like to get credits on drupal.org, check documentation.

Thank you for your contribution!

[froboy]

ok to test

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[froboy]

retest this please

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[froboy]

retest this please

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[podarok]

is there a way to invalidate only needed cache bin without flushing all caches?
upgrade path is heavy (

[podarok]

@froboy

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