Release 0.5.1 - F-Droid build fix

Changelog

Bugfixes 🐛

• Fix F-Droid build (#62).

Improvements 📈

• Add a video tab, with vertical swipe ability when playing a video.
• Merge updated English strings (#34, thanks to @comradekingu).
• Support dragging the indicator of the articles.

Dev 💻

• Update Flutter to 3.7.3.
• Update translations.
• Upgrade some packages and override intl to 0.18.0.
• Remove the SignalR screen to comply with F-Droid's build inclusion (compiled .jars, #62). See AS-Devs/signalr_flutter#51