UK SSO: Multiple code style and documentation improvements.
DS-430 Use filtered text for Fact Page intro
DS-431 Display call_to_action variable instead of hardcoded text
Merge pull request #3151 from aaronschachter/fact_page

Fact Page fixes
Merge pull request #3147 from sergii-tkachenko/DS-377_uk-sso-refactoring

UK SSO: Multiple code style and documentation improvements.
Moves docs into Github wiki
Merge pull request #3152 from aaronschachter/zendesk_docs

Zendesk documentation