README: Fix link to "starter" issues

[joshtrichards]

Was linked to unused tag. Changed link to issues tagged good first issue.

• Tests written, or not not needed

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	80	82
Errors	0	0

SpotBugs

Category	Base	New
Bad practice	26	26
Correctness	85	85
Dodgy code	430	430
Experimental	2	2
Internationalization	9	9
Malicious code vulnerability	2	2
Multithreaded correctness	9	9
Performance	59	59
Security	18	18
Total	640	640

Lint increased!

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/12054.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.

[github-actions]

blue-Light-Screenshot test failed: https://www.kaminsky.me/nc-dev/android-integrationTests/12054-Screenshot-blue-Light-13-11

[AndyScherzinger]

Thanks for the fix 💙

[github-actions]

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