refactor: consolidate Algolia search into external js/algolia-search.js#801

Parth-Garg2629 wants to merge 4 commits intoprecice:masterprecice/precice.github.io:masterfrom

Parth-Garg2629:refactor/algolia-search-external-jsParth-Garg2629/precice.github.io:refactor/algolia-search-external-jsCopy head branch name to clipboard