docs: add languages to code highlighting

[hsheth2]

I picked these syntax themes because they looked good, but am not particularly attached to them - we can definitely change it around. Specifically, the vscode light theme's background color feels a bit too light. Docusaurus uses some custom themes that I think look pretty good - maybe we can use those?

Adds a couple new langs to docusaurus highlighting.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

Unit Test Results (build & test)

622 tests  +1   618 ✔️ +1   15m 33s ⏱️ -10s
158 suites +1       4 💤 ±0 
158 files   +1       0 ❌ ±0 

Results for commit 7ea8042. ± Comparison against base commit e5a823e.

♻️ This comment has been updated with latest results.

[maggiehays]

the vscode light theme's background color feels a bit too light. Docusaurus uses some custom themes that I think look pretty good - maybe we can use those?

+1 - it's way too light & tough to read. Let's try Docusaurus's theme!

[hsheth2]

@maggiehays decided against changing the themes right now - main issue was (and still is) missing syntax highlighting for certain keywords