Add slug to code server

[TheZoker]

This PR:

• Adds a slug var to the code-server module
• Align the url structure of the vscode-web module with the code-server module

[TheZoker]

@mafredri Can you please give me feedback, if the url structure should be the one from the vscode-web module or from the code-server module? Thanks!

[mafredri]

@mafredri Can you please give me feedback, if the url structure should be the one from the vscode-web module or from the code-server module? Thanks!

The two modules are separate programs, so there isn't much reason to unify them. Adding the urlencode is probably a good idea, but if the behavior differs between ?folder= and omitting it, then the earlier behavior should be retained. If the behavior is the same between the two forms then the current one is fine (i.e. which folder is opened by default).

[TheZoker]

Alright, I reverted the change