Fix Broken Build Process

[manuth]

Currently, there are a few problems preventing this extension from being compiled. Thus, this PR will change following aspects of the code:

• Remove obsolete @types/socket.io as socket.io has its own type-declarations built-in
• Upgrade typescript to 4.6 as socket.io seems to use labeled tuples which requires typescript to be at least 4.0
• Replace .svg picture with .png as vsce doesn't allow .svg images inside the README.md file
• Add DOM to tsconfig.json as engine.io-parser uses the Blob-type which is exclusive to the DOM library