Add indication of search support to ecosystem project pages

### Project Affected

ALL

### Current Information

No information about search, including encrypted rooms search

### Suggested Correction

Add information about search, including encrypted rooms search

### Source

_No response_

### Additional Context

_No response_

Start by locating the ecosystem project page content or template in the matrix.org website and inspect how existing feature support is represented. Add information about general search and encrypted-room search to the relevant project pages, then verify the rendered pages show the new information consistently.

Written by the indexing model from the issue text.