Add Algolia doc search

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

• resolves Add search box to docs #4821

Description

Finally…

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[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#doc-search

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[codecov]

Codecov Report

Merging #4830 (8cf20fc) into master (7c50c18) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 8cf20fc differs from pull request most recent head 1265b01. Consider uploading reports for the commit 1265b01 to get more accurate results

@@            Coverage Diff             @@
##           master    #4830      +/-   ##
==========================================
- Coverage   99.00%   99.00%   -0.01%     
==========================================
  Files         219      219              
  Lines        7837     7834       -3     
  Branches     2169     2168       -1     
==========================================
- Hits         7759     7756       -3     
  Misses         26       26              
  Partials       52       52              

Impacted Files	Coverage Δ
src/Chunk.ts	99.82% <0.00%> (ø)
src/utils/renderHelpers.ts	100.00% <0.00%> (ø)
src/ast/variables/Variable.ts	100.00% <0.00%> (ø)
src/ast/nodes/ClassDeclaration.ts	100.00% <0.00%> (ø)

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[rollup-bot]

This PR has been released as part of rollup@3.12.1. You can test it via npm install rollup.