🚸(frontend) follow antoine's remarks on homepage and header

- show the header on homepage. Not sure we want any header on this app
actually but I guess he's right since we have one it feels more
consistent to have it everywhere
- show logged in email in header. ditched it because i didn't quite get
the value of showing it all the time in this app but i guess it's better
than nothing
- remove user info from settings. Since they are back in the header, no
need

src/frontend/panda.config.ts

@@ -181,6 +181,7 @@ const config: Config = {
           active: { value: '{colors.gray.300}' },
           text: { value: '{colors.default.text}' },
           border: { value: '{colors.gray.500}' },
+          subtle: { value: '{colors.gray.400}' },
         },
         primary: {
           DEFAULT: { value: '{colors.blue.700}' },