feat(episodes): add create form and view pages for episode

• add james-heinrich/getid3 library as a dependency to composer.json
• update DEPENDENCIES.md file
• fix episodes table migration script
• add js devDependencies: prettier, @prettier/plugin-php and lint-staged to automatically format staged files before commit
• reformat all files to the prettier format
• refactor code by separating some logic as helper functions
• overwrite existing files when uploading new files with the same name

fixes #1 (closed)