[Feat] implement user configuration

[quantumfate]

As a user I want to be able to create user configurations for specific scenarios as well as for different machines. Managing these configurations can be a nuisance when there is no easy way to integrate them into the runtime file.

• update the install script to generate a new user configuration (with a prompt)
• IMPORTANT: update existing user configurations
• a template repository or something else

The configuration should provide various ways to alter the runtime of quantumvim:

• general settings
• plugins
• languages
  • dap
  • lsp
  • null-ls (we use this until there is something new)