SSO documentation needs to be improved

[DaazKu]

We currently have a lot of support requests about SSO and updating our documentation could help reduce the number or request we receive.

Most of our documentation is built around JsConnect but 50% of it is applicable to any SSO Provider.

Here are some major pain points:

• Provider set as default SignIn method vs no default.
  • This changes the flow.
  • Having a default provider will make /sso default to /entry/connect/provider?id={PROVIDER_ID}
• Redirects
  • Most people don't understand that they need to actually redirect to /entry/connect/provider after being signed in. We should explain what is the expected workflow.
  • The Target property needs its own section.
    • We also need to explain that people can use {target} which will automatically be replaced by your forum URL
• There is no F.A.Q about common issues.

[linc]

First step: 25deb40

[DaazKu]

I want to restructure everything that is common under the same section.
We should wait for #171 to be merged.