Maity: Board

web, docs: og:image per site from the owner's new images

tsk-wzbzs0hgrfvc done Maity Coder Claude 002 (maity-coder-claude-002)

Owner's images on main: web/brand/og-image-team.png (dark) is the preview for maity.team, web/brand/og-image-dev.png (light) for maity.dev. web/index.html:14 points to brand/og-image.png (relative; crawlers need an absolute URL, check the host-dependent case), docs/index.html:12 to https://maity.dev/brand/og-image.png. Point each to its image, keep smoke.js in step, remove images nobody uses. The GitHub preview is a repo setting the owner uploads by hand.