fix: remove dead Play Store links for unavailable Android apps

[kaif0910]

Description

This PR removes or replaces dead Google Play Store links in the Android Apps
section that currently return 404 errors, and updates them to valid GitHub
sources where appropriate.

Changes

• Removed Play Store badges for unavailable Android apps
• Replaced broken navigation links with valid GitHub sources
• Limited modifications only to the Android Apps section

Issue

Fixes #858

Summary by Sourcery

Update Android app links to remove dead Google Play Store entries and point users to maintained sources.

Bug Fixes:

• Remove broken Google Play Store badges and links for SUSI.AI, Phimp.me, Eventyay Attendee, and Eventyay Organizer Android apps.
• Update primary Android app tiles to link directly to the corresponding GitHub repositories instead of unavailable Play Store listings.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR cleans up the Android Apps section in both index.html files by removing dead Google Play Store links/badges for unavailable apps and updating the primary app tiles to link to the corresponding GitHub repositories instead, while preserving existing F-Droid and GitHub buttons.

Flow diagram for Android app card link structure after changes

flowchart TD
  Android_Apps_Section --> SUSI_Card
  Android_Apps_Section --> Phimpme_Card
  Android_Apps_Section --> Eventyay_Attendee_Card
  Android_Apps_Section --> Eventyay_Organizer_Card

  SUSI_Card["SUSI.AI Android card"] --> SUSI_Tile_Link["Primary tile link to susi_android GitHub"]
  SUSI_Card --> SUSI_FDroid_Badge["F-Droid badge to ai.susi"]
  SUSI_Card --> SUSI_GitHub_Badge["GitHub badge to susi_android"]

  Phimpme_Card["Phimp.me Android card"] --> Phimpme_Tile_Link["Primary tile link to phimpme-android GitHub"]
  Phimpme_Card --> Phimpme_GitHub_Badge["GitHub badge to phimpme-android"]

  Eventyay_Attendee_Card["Eventyay Attendee App card"] --> Attendee_Tile_Link["Primary tile link to open-event-attendee-android GitHub"]
  Eventyay_Attendee_Card --> Attendee_FDroid_Badge["F-Droid badge to com.eventyay.attendee"]
  Eventyay_Attendee_Card --> Attendee_GitHub_Badge["GitHub badge to open-event-attendee-android"]

  Eventyay_Organizer_Card["Eventyay Organizer App card"] --> Organizer_Tile_Link["Primary tile link to open-event-organizer-android GitHub"]
  Eventyay_Organizer_Card --> Organizer_FDroid_Badge["F-Droid badge to com.eventyay.organizer"]
  Eventyay_Organizer_Card --> Organizer_GitHub_Badge["GitHub badge to open-event-organizer-android"]

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File-Level Changes

Change	Details	Files
Update Android app tiles to point to GitHub repos and remove dead Google Play Store badges for unavailable apps in both index.html variants.	Change main anchor links for SUSI.AI, Phimp.me, Eventyay Attendee, and Eventyay Organizer Android apps from Google Play URLs to their respective GitHub repository URLs. Remove the Google Play badge/button anchors for these four apps within their button rows, leaving F-Droid and GitHub buttons unchanged. Apply the same set of link and badge updates in both index.html and index1.html to keep the two landing pages consistent.	index.html index1.html

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#858	Fix broken links on the Android Apps section so that clicking the listed app sections no longer leads to 404 or 'URL not found' errors.	✅

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