Fixes: #202

The PhoneNumberForm is used in "Add SMS" and "Add Phone Call" pages.
The PhoneUpDownForm is a subclass of PhoneNumberForm and
adds "up" and "down" boolean fields. It is used in "Add Signal"
and "Add WhatsApp" pages.

Fixes: #428

Fixes: #465

Need it to escape quirks mode in email clients.

Fixes: #347

Fix simple typo in docs, libary -> library

There is a small typo in templates/docs/python.md.

Should read `library` rather than `libary`.

Fixes: #348

Fixes: #450

Move terraform-provider-healthchecksio to the "API Wrappers"
category, which is more appropriate than "Tools for Self-Hosting".

Move terraform-provider-healthchecksio to the "API Wrappers"
category, which is more appropriate than "Tools for Self-Hosting".

Fixes #455

Fixes #282

Planning to use it for sensitive operations (add/remove security keys),
change email, change password, close account.

The decorator sends a six-digit confirmation code to user's email
and renders a form for entering it back. If the user enters the
correct code, the decorators sets a sudo=active marker in
user's session, valid for 30 minutes.

Fixes: #429

Fixes: #442

Fixes: #440

Fixes: #435