Add redirect if www is missing

[chrifro]

Describe the bug

• If I'm using a URL without "www", I should be redirected to the correct page. Otherwise, this causes error messages and frustrated users.

• Twitter always shortens a link, thereby linking to a page causes an error message (https://twitter.com/tommyhpratama/status/1346112148703834113)

according to @nisarhassan12 this is probably something that has to be implemented on the server side (https://github.com/gitpod-io/website/issues/842#issuecomment-739048822)

[svenefftinge]

A simple solution for gitpod.io could be to forward to www.(URL) in case of 404. @geropl WDYT?

[geropl]

Yes, adding a error handler for 404 here should do the trick: https://github.com/gitpod-io/gitpod/blob/master/chart/config/proxy/lib.locations.conf#L45

[AlexTugarev]

@geropl, 'you mean an error_page inside of the location /, right?
I'm wondering how to verify 🤔