(Remove) Tmdb keywords

[Roardom]

This extra data isn't useful for anything except being spoiled about the movie/tv. The only usecase its had in the past was searching for anime, but we have a language filter for search now, and filtering by ja and animation seems to be more reliable than searching for the anime keyword.

[what-the-diff]

PR Summary

• Elimination of Keyword Functionality
  Removal of code components that once supported keyword functionality, enhancing clarity and simplicity in application structure.
• Extraction of Keyword Model
  Complete removal of the Keyword model, rendering the keyword capability deprecated in the app.
• Database Modifications
  Introduction of a migration script to eliminate the keywords table from the database schema, aligning with the fulfilled removal of keywords.
• API Documentation Amendments
  Removal of any keyword-related details from the API documentation, showcasing the absence of the feature.
• Consistency Across Translation Files
  Updated translation files by deleting keyword references, ensuring uniformity following their model and API removal.
• Cleanup of Unnecessary Imports and Code
  Removed unused imports and comments associated with keywords, leading to a cleaner, lighter codebase.
• Deletion of Keyword Fetching
  Removing related API calls and processing functions from 'helper.js', leading to simpler, more streamlined code.
• Removal of Keyword User Inputs
  Deletion of keyword fields from the user interface, simplifying user interaction and data input.
• Removal of Keyword Display
  Erased any presentational aspects of keywords from application's interface, ensuring alignment with facility's removal.
• Adaptation of Tests
  Tests were updated to reflect the feature removal, evidence of the application's behavior change.