feat!: add docsearch v4 support

.github/ISSUE_TEMPLATE/docsearch_ui.md

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+---
+name: Enhance the search-UI
+about: Everything related to the front end library
+---
+
+<!--
+  Thanks for participating in this project!
+  Please:
+    - make sure you are using the latest version of the library.
+    - do at least one GitHub search in current issues, maybe your question is already here
+-->
+
+**Do you want to request a _feature_ or report a _bug_?**
+
+**What is the current behavior?**
+
+**If the current behavior is a bug, please provide all the steps to reproduce and a minimal
+[JSFiddle][3] example or a repository on GitHub that we can `npm install`
+and `npm start`.**
+
+**What is the expected behavior?**
+
+[1]: https://typesense.org/docs/latest/guide/docsearch.html
+[2]: https://github.com/typesense/typesense-docsearch-scraper
+[3]: https://jsfiddle.net/