[WIP] Add PageFind full search

[gerteck]

To track progress of adding PageFind

Current Issues

• How to index pages only if pagefind is enabled in plugins?
• How to set a custom pagefind element / integrate into searchbar?
• How to create a new custom vue component for page find?

Findings:

• Search data for markbind native search is passed via "searchdata" field in the component!
  • I could probably pass in the default UI through this field as well.
  • Could pass in the search index through this as well.
    Require further investigation.

Archive:
Bug (fixed) found in searchbar component. (Native searchbar, where the prior results load in some random place only after scrolliing appears in the correct position)

Changelog:

packages/core/:

• Add pagefind dependency for indexing files in package.json

• Add indexing process in /src/Site

• Updated compilerOptions to tsconfig.json to correctly convert .ts to appropriate .js code for module resolution.

package/core/src/plugins

• Add pageFind.ts

package/vue-components/src

• Update Searchbar.vue

Ignore: (To pass CI Checks)

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Proposed commit message: (wrap lines at 72 characters)

Add PageFind

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Checklist: ☑️

[gerteck]

Currently, the default PageFind UI does not fit into MarkBind's look?