Feat: handle clarity 2 generated api references

[hugocaillard]

Description

Fix: #1575

• [x] Dynamic pages for language-functions and language-keywords (based on the stacks-blockchain generated docs)
• [x] Proper support for Clarity language in Prism
• [x] Removed some dead code

Note: functions and keywords references now display a line: "introduce in: Clarity ". We could have implemented a select to display only functions available in a given Clarity version but it's not trivial because docusaurus table of content aren't dynamic. The other option would have been to have sub-menus for version "Clarity > Functions > Clarity 1 | 2", but it would have an extra click. After implementing both, I decided to remove the complexity, assuming that >80% of the time, developers will want to see the latest version (and we specify if a function is available in a given version)

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Name	Status	Preview	Comments	Updated
stacks-docs	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 27, 2023 at 1:16PM (UTC)

[wileyj]

looks good to me. any comments @kenrogers before i merge?