Remove the angular webclient, and give an explanation 'welcome page' instead which links to the various clients (SYN-670)

[matrixbot]

Submitted by @​matthew:matrix.org

(Imported from https://matrix.org/jira/browse/SYN-670)

[ara4n]

for now it could just link to matrix.to

[ara4n]

although i'd prefer it if we shipped a minimal matrix-react-sdk client so folks could just jump straight in. (or that matrix.to supported a ?homeserver= style option so that at least the target clients then took you to talk to the right HS)

[richvdh]

I remain unconvinced about the need to ship a client with synapse, ftr. I see enough people getting confused about the distinction between clients and servers (and thinking that they have to use the client that ships with their HS) that I think we would be better off separating them and making people jump through a separate hoop to install a client.

(Also: the debian package doesn't include a client. We should at least be consistent.)

[richvdh]

matrix.to supported a ?homeserver=

+1 to this, in any case

[ara4n]

please can we ditch it in favour of a link to matrix.to? See element-hq/element-web#2908 for example pain with the current setup...

[richvdh]

more-or-less fixed by #4289/#4290