docs - appearance (#23644)

docs/README.md

docs/administration-guide/13-embedding.md

docs/administration-guide/fonts.md

docs/administration-guide/start.md

docs/enterprise-guide/customize-embeds.md

docs/enterprise-guide/fonts.md

docs/enterprise-guide/images/appearance/chart-colors.png

docs/enterprise-guide/images/appearance/metabot.png

...erprise-guide/images/appearance/user-interface-colors.png

docs/enterprise-guide/start.md

docs/enterprise-guide/whitelabeling.md

docs/operations-guide/environment-variables.md

docs/users-guide/01-what-is-metabase.md

src/metabase/public_settings.clj