Add "compilers" category.

[mental32]

Sub categories include: transpilers, interpreters, and compilers.

I decided to follow the precedence set by "parser-implementations" and "parsing" for these categories since they felt appropriately related.

Resolves #1412

[rust-highfive]

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[Turbo87]

we'll discuss this one last time on the weekly on Friday and then we can hopefully have this merged :)

[Turbo87]

@mental32 we just discussed this and will merge this in the next days. since a change like this will make the rollback of a bad deployment harder we would like to first deploy the other queued up changes before merging this. :)

[Turbo87]

@bors r+

[bors]

📌 Commit 0ea4e15 has been approved by Turbo87

[bors]

⌛ Testing commit 0ea4e15 with merge bf22455...

[bors]

☀️ Test successful - checks-actions
Approved by: Turbo87
Pushing bf22455 to master...