Shortgpt

- Requiring a youtube url as the subscribe animation url in the EditingStep.ADD_SUBSCRIBE_ANIMATION step.
- Adding a default subscribe animation youtube link by default shipped in the AssetDatabase
- Making path imports relative for gpt prompts and editing blocks and flows.

- Improving logs in content engines

- Adding AssetType in AssetDatabase
- Adding ApiProvider in api_db
- Fixing pip libary missing editing_framework module, prompt_template module

- Fixing the AssetDatabase when it's empty

- Implemented the content_translation_engine; a multilingual video dubbing content engine. The source can be found at shortGPT/engine/content_translation_engine.py.
- Implemented the new EdgeTTS voice module; it can be found at shortgpt/audio/edge_voice_module.
- Added documentation which can be found under docs/.