Better markup

* Add COC file, remove some files from generated archives

* Remove the code of conduct's content, and add a link to the website

Better eol conversion in .gitattributes

Don't use sh to run command

Since it is no longer necessary...

feature: add .env.dist

Remove usage of obsolete SYMFONY_SKIP_REGISTRATION

Changed var/logs to var/log

To be consistant with sf4, the "logs" folder has been renamed to "log"

Push Docker images to container registry

Run composer scripts in Dockerfile

Fix dockerfile alternate paths

Remove ./ relative path notation which doesn't work on latest version of Docker + Compose

See: https://docs.docker.com/compose/compose-file/#dockerfile

Minor enhancements for php Dockerfile

Fix PHP-CS-Fixer config

Update admin

Fixed docker for Windows