Update Documentation in Conformance to the Documentation Guide

[vishnuravi]

Update Documentation in Conformance to the Documentation Guide

♻️ Current situation & Problem

Addresses #11.

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[codecov]

Codecov Report

Merging #17 (95a2e29) into main (2d2b809) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   80.07%   80.07%           
=======================================
  Files           5        5           
  Lines         311      311           
=======================================
  Hits          249      249           
  Misses         62       62           

Files	Coverage Δ
...urces/SpeziContact/Contact Views/ContactView.swift	81.35% <ø> (ø)
...rces/SpeziContact/Contact Views/ContactsList.swift	51.86% <ø> (ø)
Sources/SpeziContact/Models/Contact.swift	100.00% <ø> (ø)
Sources/SpeziContact/Models/ContactOption.swift	86.16% <ø> (ø)

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[PSchmiedmayer]

Thank you for the great documentation improvements and added examples, great appreciated @vishnuravi!

I fixed some smaller issues around dark mode and wordings so we don't need an other feedback loop. Feel free to merge the PR and tag a new release once you are happy with all the changes 🚀