Svelte Syntax Highlighting Not Working

[michael-tharrington]

Describe the bug

When writing a code block and trying to use syntax highlighting for Svelte, it does not work.

To Reproduce

1. Go to write a new post on DEV
2. Create a code block and designate it as written in Svelte (e.g. see screenshots below)
3. Preview the post
4. Notice that code block is not formatted

Expected behavior

Codeblocks should recognize Svelte syntax highlighting.

Screenshots

Additional context

This issue was raised by @Siddhant-K-code in the moderator channel.

[github-actions]

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[ktmouk]

rouge-ruby gem has recently supported Svelte syntax, but it seems it has not been released as a gem yet.
rouge-ruby/rouge#1979