docs: 📝 add algolia docsearch support

[zuriscript]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[x] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

No docsearch avalilable

What is the new behavior?

You can now search the docs, Thanks algolia :D