Add configurability for huggingface models

[StephanAkkerman]

After everything else is done we should add a config file where the models can easily be changed.

• Huggingface models
• Huggingface datasets
• Model parameters
• Other things that we do not want in the GUI?

For instance a config.yaml like this:

LLM:
  MODEL: "microsoft/Phi-3-mini-4k-instruct"  
  SYSTEM_PROMPT: "You are a helpful AI assistant for making mnemonics. You will help users create a mnemonic by generating a cue that connects two words, keep it short and catchy!"
IMAGE_GEN: 
  MODEL: "black-forest-labs/FLUX.1-schnell"
  ETC.

This is primarily for #3 and #16 as these models can change from time to time depending on new developments

[StephanAkkerman]

Should be done after #51 is done, so we can test it