ENG-1632 remove legacy markdown parsing for migrated routes (#956)

* Remove deprecated documentation components and clean up package dependencies

- Deleted unused components related to documentation, including DocsHeader, DocsLayout, DocsPage, DocsRedirect, PrevNextLinks, Prose, TableOfContents, and associated utility functions.
- Removed outdated dependencies from package.json to streamline the project and improve maintainability.

* lock

* .

Author: mdroidian