update README, wiki, used libraries, screenshots, whats new dialog

[Robert Goldmann]

• README
• wiki
• used libraries (about page)
• screenshots
• what's new dialog

[Robert Goldmann]

✨ New features

• text #ticket

✏️ Improvements

• show balance for every account in account select #749
• added a tooltip for transfers in transaction overview to show source and destination account #756
• updated dependencies #744

🐛 Bugfixes

• text #ticket

⚠️Deprecations