Sort out community languages

[alexeyinkin]

The old ported project is referencing 4 languages outside of highlight.js package:

https://github.com/git-touch/highlight.dart/blob/8c08291d18d1e3fdab8564cc3f09726e262e555d/tool/highlight.js#L117-L136

We excluded them when migrating to the new highlight.js.
We should sort them out. Some of them got included into the highlight.js since. Others need to be looked up.

The list:

• vue
• graphql
• gn
• solidity