Clarify that managed profiles are optional and document the browser origin allowlist - #1367

Changed pages include:

• client/index.html - view
• client/_shell.html - view
• client/business/index.html - view
• client/contact/index.html - view
• client/en/index.html - view
• client/payments/index.html - view
• client/privacy-policy/index.html - view
• client/pt-br/index.html - view
• client/terms-and-conditions-full/index.html - view
• client/terms-and-conditions/index.html - view

There are more changes not included in the list