Remove outdated WebSocket configuration from Vaulwarden guide

[nifadyev]

WebSockets are enabled by default from version 1.29.0 wiki, and it's not necessary now to configure them. Caddyfile is changed as well wiki

It'd be helpful to add a guide for proper ADMIN_TOKEN generation from here

Also, #31 could be closed as outdated and irrelevant

P.S.: Thank you for such useful and time-consuming work. It saved me tons of time setting up my home server.