docs: align org card with openral.com messaging (harness + swappable rSkills)

List OpenVLA-OFT in the rSkill families (issue #55)

docs: expand org card with stats, sim engines, correct email and benchmark count

fix: update Discord invite link in space card README

Reword OpenRAL summary tagline

Point GitHub link to OpenRAL/openral org repo

Update Discord (permanent invite) + docs URL links

Update README.md

Update README.md

initial commit