Adding new pages for developer+ launch

- Fixes #660
- Fixes #652
--amend
wording, additional questions
Removing TM symbol on developer+ after first usage on page.
Fixing typo.
Reworking signup buttons
Disabling UK Signup
Adding UK signup url
Making "developer+" lowercase for consistency.
Update index.html

Replacing unicode chars for html entity equivalents.
Fixed first para of FAQ.
my suggestions for fa
Adding new pages for developer+ launch

- Fixes #660
- Fixes #652
--amend
wording, additional questions
Removing TM symbol on developer+ after first usage on page.
Fixing typo.
Reworking signup buttons
Disabling UK Signup
Adding UK signup url