Fix link to the docs

[synfinatic]

URL to the docs should be to the pretty site, not raw markdown.

$ aws-sso completions --no-config-check
WARNING No config file found!  Will now prompt you for a basic config...

**********************************************************************
* Do you have questions?  Do you like reading docs?  We've got docs! *
* https://github.com/synfinatic/aws-sso-cli/blob/main/docs/config.md *
**********************************************************************


✗ SSO Start URL Hostname (XXXXXXX.awsapps.com): |