Add Gitea ONLYOFFICE Bridge (#189)

Adds Gitea ONLYOFFICE Bridge to the active Plugins section.

What it is:
Gitea ONLYOFFICE Bridge is a self-hosted bridge for opening Gitea repository documents in ONLYOFFICE Document Server. It adds Gitea UI integration, OAuth-based permission checks, read-only previews, full-screen editing, and save-back commits through a small Flask/Gunicorn service.

Project links:
- GitHub: https://github.com/NovichekLIS/Gitea-onlyoffice
- Release v1.0.0: https://github.com/NovichekLIS/Gitea-onlyoffice/releases/tag/v1.0.0

---------

Co-authored-by: oleglistratov <o.d.listratov@systematom.ru>
Reviewed-on: https://gitea.com/gitea/awesome-gitea/pulls/189
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Novichek <64715+novichek@noreply.gitea.com>

README.md

@@ -161,6 +161,7 @@ Entries are grouped by maintenance status:
 - [Gitea-VSCode](https://marketplace.visualstudio.com/items?itemName=ijustdev.gitea-vscode) - Gitea Issue Tracker for vs-code `MIT` `TypeScript`
 - [Gitea](https://github.com/LeonDevLifeLog/gitea-idea-plugin) - plugin for JetBrains IDEs (Idea, Android Studio, etc.). `MIT` `Kotlin`
 - [Gitea-Anchorpoint](https://docs.anchorpoint.app/docs/1-overview/integrations/gitea) - Gitea integration plugin for an artist friendly Git client.
+- [Gitea ONLYOFFICE Bridge](https://github.com/NovichekLIS/Gitea-onlyoffice) - ONLYOFFICE document preview and editing bridge for Gitea. `MIT` `Python/JavaScript`
 - [gitea-conventional-comments-button](https://github.com/sebastian-sauer/gitea-conventional-comments-button) - A browser extension to add buttons for [conventional comments](https://conventionalcomments.org/) to review comment boxes. `MIT` `JavaScript`
 
 ### Scripts