chore: Create release 1.0.0 and landing page

[AzizX-coder]

This PR creates a new release for the ACal app. It bumps the version to 1.0.0, builds the Android application to generate the ACal.apk file, and provides a modern landing page in the landing/ directory. The landing page showcases the app's features and includes a prominent download link. Minor ESLint errors were resolved to facilitate the build.

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PR created automatically by Jules for task 8390360232440630411 started by @AzizX-coder

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