fix some style issues

- update .devcontainer settings: remove auto-formatting
for php + set intelephense as default formatter
- remove prettier php plugin as it lacks php 8 support
- add captain hook action for checking style pre-commit
- fix style with ecs on all files except views

update composer dependencies

- move and refactor Image.php from Libraries to Entities folder
- update some database field names
/ types
- update composer packages

- update CI process to include quality stage (tests + code review)
- add captainhook to install git pre-commit & pre-push hooks
- remove .devcontainer Dockerfile to use project's docker-compose services: all
services can now be started automatically using vscode
- update docs/setup-development.md

- merge publication date fields into one field instanciated with flatpickr datetime picker
- get user timezone to convert user publication_date input to UTC
- remove setPublishedAt() method from episode entity
- add publication pill component to display the episode publication date info
- clear cache after episode insert
- use CI is_really_writable() helper in install instead of is_writable()
- fix latest episodes layout
- update tsconfig to only include ts folders
- update DEPENDENCIES.md to include flatpickr
- add format_duration helper to format episode enclosure duration instead of translating it (causes
translation bug)
- add Time.ts module to convert UTC time to user localized time for episode publication dates
- fix some layout issues
- update php and js dependencies to latest versions

closes #47

- add .editorconfig file
- format all files to comply with castopod's coding style
- switch parsedown dependency with commonmark library to better follow commonmark spec for markdown
- add prettier command to format all project files at once

closes #16

- add node service in docker-compose.yml
- update .devcontainer Dockerfile by adding node, npm and vim
- init package.json for npm with tailwindcss, postcss, commitlint and commitizen as dev dependencies
- update default layout main header and footer
- replace CI's welcome_message.php with home.php listing all podcasts
- add AUTHORS.md file
- add docs folder in which to place castopod's technical documentation