Enable this to require captcha validation for user login. You also must
enable `ENABLE_CAPTCHA`.
Summary:
- Consolidate CAPTCHA template
- add CAPTCHA handle and context
- add `REQUIRE_CAPTCHA_FOR_LOGIN` config and docs
- Consolidate CAPTCHA set-up and verification code
Partially resolved#6049
Signed-off-by: Xinyu Zhou <[email protected]>
Signed-off-by: Andrew Thornton <[email protected]>
Co-authored-by: Andrew Thornton <[email protected]>