Rebuild Aliki's searching mechanism

[st0012]

Rebuild Aliki's search mechanism with a custom search index and improved ranking algorithm.

Key changes:

• Aliki now generates its own search index (js/search_data.js) instead of using the shared JsonIndex generator (can be removed along with Darkfish in the future)
• New search ranking algorithm with better prioritization:
  • Lowercase queries prioritize methods; uppercase queries prioritize classes/modules/constants
  • Exact matches rank higher; shorter names preferred
  • Class methods rank above instance methods (I don't have strong opinion on this one)
• Search results now display type badges (class, module, const, method)
• Constants are now included in search results

Closes #1497

[matzbot]

🚀 Preview deployment available at: https://da19e35e.rdoc-6cd.pages.dev (commit: b255555)

[tompng]

I don't think the current search is bad, except for the search result order and constant not searched.
It has advanced search: query = add_alias match to add_module_alias.

How about first match against full_name with regexps generated by the old searcher, and then reorder the result with score?

[st0012]

I've updated the implementation so now these are supported:

• Array#fil lists Array#fill, Array#filter, and Array#filter!
• Array.try lists Array.try_convert
• _defined? lists
  • 
• insmet lists
  • 

[tompng]

👍