chore: adjust demo styles

fix: limit example editor height

fix: build example components for the showcase

fix: add og image meta tag

fix: do not scale playground on desktop viewports

fix: use react-router link component

chore: add a showcase section to the bottom of the home page

chore: style content to fit mobile layout

fix: always use light theme

feat: add showcase page

feat: add cloud setup assistant link

chore: adjust accordion style

docs: renew README content

docs: provide faq for composify cloud

chore: setup google analytics