Remove Non-Argosy Android app references from README

[milktoastrat]

Removed references to non-Argosy Android apps from the Mobile section of the README

Description
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Checklist
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• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR
• I've added unit tests that cover the changes

Screenshots (if applicable)

[greptile-apps]

Greptile Summary

This PR removes two community Android app entries (romm-mobile by @mattsays and romm-android by @samwelnella) from the Mobile section of the README, along with their corresponding markdown link definitions, to keep only the official Argosy launcher and the iOS community app listed.

• Removes bullet points for romm-mobile and romm-android from the Mobile community section (lines 57–58 in the original file).
• Removes the two corresponding link reference definitions ([romm-mobile] and [romm-android]) from the bottom of the file — no dangling references remain.
• The resulting README is clean, well-formed, and consistent; no other references to the removed apps exist anywhere in the file.

Confidence Score: 5/5

• This PR is safe to merge — it is a minimal, self-contained documentation change with no code impact.
• Only the README is modified. Both the list items and their link definitions are properly removed together, leaving no dangling references or broken markdown links. No code, tests, or configuration files are touched.
• No files require special attention.

Important Files Changed

Filename	Overview
README.md	Removes two Android community app listings (romm-mobile and romm-android) and their corresponding link definitions — change is clean, consistent, and complete with no dangling references.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README Mobile Community Apps] --> B[🔷 Argosy - Native Android/iOS client]
    A --> C[romm-ios-app - Native iOS app]
    A --> D[romm-mobile - Android app ❌ REMOVED]
    A --> E[romm-android - Android app ❌ REMOVED]

    style D fill:#ffcccc,stroke:#cc0000,color:#cc0000
    style E fill:#ffcccc,stroke:#cc0000,color:#cc0000
    style B fill:#d4edda,stroke:#28a745
    style C fill:#d4edda,stroke:#28a745

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_{Last reviewed commit: 6e8f4c3}