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 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

add missing locale to category_options cache name

fixes #100

fixes #42, #61

- add pages  migration, model and entity
- add page controllers
- update routes config to input page forms and page view in public
- fix markdow editor focus area
- show pages links in public side footer

closes #24