Update fastlane description based on readme (full list of features and supported servers)

It supports:

- Mastodon, Pleroma, Pixelfed and Friendica.

- Mastodon, Peertube, Pixelfed, Misskey, GNU Social, Pleroma, Friendica

The app has advanced features:

- Compose threads

- Multi-accounts support

- Schedule messages from the device

- Follow and interact with remote instances

- Cross-account actions with a long press

- Translation feature

- Art timelines

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- Multiple options for automatic updates

  - Push notifications via UnifiedPush (including ntfy on FDroid)

  - Remain connected for Live Notifications

  - Delayed notifications (connect every 30 seconds)

- Replace youtube and twitter links with links to invidious and nitter instances

- Custom themes, import export, and definition

- Import and export app's database

- Emoji pciker with custom emoji

- Multiple launcher icons

- Advanced toot filtering

- Special art timeline for mastoart tag

- Export toots

- Customize url sharing to directly share urls to other services

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