Update version to 0.8.2

[smk762]

To test:

• Confirm version number in app is displayed as 0.8.2
• Confirm 'DEX' Tab disabled
• Confirm swap buttons removed from coin pages
• Confirm no other way to access DEX tab
• Confirm 'Fiat' icon in sidebar removed

[ShantanuSharma9873]

One thing here, as the DEX tab and the 'Trading Bot' feature is removed. Do we need to remove the 'Import Swap Data' & 'Import Swaps' options as well from the settings ?

[smk762]

One thing here, as the DEX tab and the 'Trading Bot' feature is removed. Do we need to remove the 'Import Swap Data' & 'Import Swaps' options as well from the settings ?

This applies to the web app, not the desktop app.