fix: Update mobile development link to a valid one

[OrneyVortex]

Updated the readme!
Previous link shows a 404 error

Proposed changes (including videos or screenshots)

Changed to the Mobile App docs link:

Issue(s)

Steps to test or reproduce

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[Gustrb]

Hey @OrneyVortex, thanks for the contribution! Could you please put the PR in the pattern we follow? Something on the line of:
fix: Update mobile development link to a valid one
or so

[OrneyVortex]

@Gustrb done!
and sorry will keep it the better way from next time!