Improve discoverability of oCIS demo users

[pascalwengerter]

Is your feature request related to a problem? Please describe.

Just tried to figure out which example users I can use when running oCIS locally. The link on https://owncloud.github.io/clients/web/backend-ocis/ (when signing in, use one of the available test users) is broken, and a short discussion with @butonic revealed it's not as easily discoverable as we would like it to be.

Describe the solution you'd like

• Fix the broken link mentioned above
• Create an overview for the (local) demo users that is easily discoverable using the search functionality on owncloud.github.io

Describe alternatives you've considered

Digging through the ocis repo of course eventually yields the same results, but isn't as user friendly.

[wkloucek]

The link works for me:

I will try to make it more prominent / accessible today.

[wkloucek]

@pascalwengerter @butonic What do you think about this approach?
I added an extra site below getting started and present the demo users in a table (#1907)

[pascalwengerter]

Love it!

[wkloucek]

Fixed by #1907