Properly handle adding third-party accounts to Discord

[MenacingPerson]

Aknowledgements

• [X] I have checked that there's no other issue describing the same or similar problem that I currently have, regardless if it has been closed or open.

• [X] I can confirm that this is not an issue with the Discord website, but it is a problem specific to the WebCord itself. I have tested if this bug occurs on Chromium/Chrome or any other Chromium-based browser that uses unpatched/upstream Chromium engine.

• [ ] I have tried running the build from the master branch and it does not have any fixes implemented according to my issue.

• [ ] My issue describes one of the unstable and/or not fully implemented features.

• [ ] I have found a workaround to mitigate or temporarily fix this issue in affected releases (please write it in Additional context section below).

Operating System / Platform

🐧️ Linux

Operating system architecture

x64 (64-bit Intel/AMD)

Electron version

21.1.0

Application version

v3.8.8

Bug description

For example, when connecting github account, it opens https://discord.com/connections/github?loading=true in firefox.

Additional context

No response

[SpacingBat3]

It makes sense WebCord will do that, there's almost no exceptions for opening the external links outside of WebCord.

There's also no logic for adding account, it's something I've never done from WebCord.

Also since #294 describe basically the same bug (it's not expected sites such like this to properly work outside of WebCord), but it's focused on further consequences of this bug, I'll just close it in favour of this issue ticket.