docs: update IDE integration page

[hverlin]

• Add additional explanations + screenshots for shims
• mention that one can use mise which/mise where as a fallback as well
• Add URL to existing mise plugins

[hverlin]

We can add other IDEs here as well. I wanted to add a screenshot for nvim but there is actually a lot to configure to get a Node.js debugger running

[jdx]

I suppose it depends on how people use it, but for me I have no need to configure neovim because I always run it from a project directory with the tools configured and they don't need to change in that session

[hverlin]

yeah, I meant I wanted a screenshot with the js debugger in nvim, but that's too much to configure. I usually only use it for light configuration edits

[134130]

Thanks!