Update README.md

[thomasbuilds]

• Replaced the root README.md with a symlink to packages/solid/README.md to eliminate duplication and centralize documentation.
• Standardized README badges to match the style used across the broader Solid ecosystem.
• Updated onboarding instructions to reflect the current recommended workflow using npm create solid.
• Improved overall structure and wording for better readability and quicker comprehension.
• Refined key sections, including core features, quick start, ecosystem links, and contribution/support (replacing hardcoded <a> links with dynamic Open Collective SVGs).
• Added references to the wider Solid ecosystem (e.g., SolidStart, Solid Router, etc.).
• Removed the unused and outdated banner.png.

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[ryansolid]

Thanks for putting this together. I’m going to close this one because it changes the README structure and project presentation much more broadly than we can review as a small docs update. In particular, replacing the root README with a pointer/symlink-style file and deleting the banner asset are not changes we want to make from this PR.

Some of the onboarding wording may be useful, but README structure and ecosystem positioning need to be handled separately and deliberately. Thank you again for the effort.