Remove unnecessary SSL code

[mkllnk]

What? Why?

Once upon a time, SSL over HTTP (HTTPS) was new and not supported by default. We still got some leftover code from those times which can be removed now.

What should we test?

• Open a private window to not use any HSTS settings.
• Visit http://staging.../ and make sure that you are redirected to https://staging.../.
• Then log in as super admin and go to the general settings.
• The two "security" options should be gone and the layout should not be compromised.

Release notes

Changelog Category: Technical changes

The title of the pull request will be included in the release notes.

Dependencies

Documentation updates

[jibees]

👌
Thanks for cleaning the code! 🧼

[filipefurtad0]

Hey @mkllnk ,

Thanks for the detailed steps on how to check this:

• Opened a private window to not use any HSTS settings.
• Visited http://staging.../ -> redirection to https://staging.../. occurred 👍
• Logged in as super admin and visited the general settings
• The two "security" options are gone now 👍
• The layout looks good 👍

All good here! Merging.

[filipefurtad0]

Hey @mkllnk,

I've noticed this error, on #devops-notifications:
https://openfoodnetwork.slack.com/archives/CEF14NU3V/p1675275022293559

Unhandled error
NoMethodError: undefined method `disable_starttls_auto' for #<Net::SMTP smtp.sendgrid.net:587 started=false>
Did you mean?  disable_starttls
              enable_starttls_auto
Location
gems/mail-2.8.0.1/lib/mail/network/delivery_methods/smtp.rb:138 - block in build_smtp_session

Emails seem not to be arriving for staging-UK - strangely, they seem to be arriving for staging-AU

[filipefurtad0]

Emails are broken on staging-FR too; this was probably introduced on this PR.

EDIT: nope, that should not be this PR - we still have the SSL setting on staging-FR