Implement DefaultTechDocsCollator

* Implements a collator for tech docs.
   * Retrieves mkdocs created search index for entities that have documentation configured
* Registers collator to expose tech docs content to be searchable
* Adds pagination to example search
* Modifies example search to contain tech docs
   * Displays docs results with link to docs and the entity name as title.
* Creates a reusable type filter to be located in the search package.
* Add tests for type filter

Signed-off-by: Jussi Hallila <jussi@hallila.com>

plugins/techdocs/package.json

@@ -51,6 +51,7 @@
     "react-router": "6.0.0-beta.0",
     "react-router-dom": "6.0.0-beta.0",
     "react-use": "^17.2.4",
+    "react-text-truncate": "^0.16.0",
     "sanitize-html": "^2.3.2"
   },
   "devDependencies": {