Docs: Overhaul README (#8005)

* docs: overhaul README for clarity and impact

* fix: update badge links and styles in README for improved visibility

* docs(README): stronger CTAs for Discord/Reddit; restore Modes/Roles incl. cloud agents

* docs(readme): add support CTA; refine modes section; clarify custom modes wording

- add centered help/links CTA under badges: [README.md](README.md:8-10)
- expand feature list to explicitly include modes: [README.md](README.md:45)
- rename section header “Modes and Roles” → “Modes”: [README.md](README.md:52)
- update wording to “Custom Modes: build specialized modes for your team or workflow”: [README.md](README.md:60)

* docs: implement @jdilla1277 suggestions for English README

- Updated header to "Your AI-Powered Dev Team, Right in Your Editor" (removed Cline reference)
- Changed line 44 to "Generate Code from natural language descriptions and specs" for better SEO
- Removed "not the other way around" phrase from line 54
- Replaced "Cloud Agents" with "Roomote Control" on line 61

As requested by @hannesrudolph, these changes are only applied to the English README.

* docs: clarify Roomote Control description and update related links in README

* Reworked the contributor list. Made translastion corrections.

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Co-authored-by: Roo Code <[email protected]>

Author: hannesrudolph