docs: Add reasoning for the allowance of http as well as user certs

[AndyScherzinger]

🚧 TODO

• merge

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	98	98
Errors	0	0

SpotBugs

Category	Base	New
Bad practice	6	6
Correctness	10	10
Dodgy code	54	54
Internationalization	3	3
Malicious code vulnerability	3	3
Performance	4	4
Security	1	1
Total	81	81

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/5975.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.