docs: remove IBC banners from homepage and drop dead Developer Hub link - #54

The PR is described as "remove the duplicated IBC banner + a dead Developer Hub link," but the diff also strips the IBC-disabled warning from four additional pages and deletes a TokenFactory row from the EVM parity table — changes that are unmentioned in the description, which additionally makes verifiably false claims about which pages still carry the notice. The mechanical parts (docs.json banner, navbar/footer links, generate-llms.mjs config) are clean.