Refactor docker deployment and user setup (#863)

[kkovaletp]

• Fix Errors in Photoview image photoview/photoview#862, address AppArmor not letting me run the container photoview/photoview#826 and maybe some other tickets: reimplemented the docker-compose user setup to enhance product setup experience and cover much more cases.

• make unique DB container name and use it in communication from Photoview

• Removed unnecessary healthcheck for photoview from docker-compose.example.yml, as it is defined in the Dockerfile; optimized Dockerfile combining all RUN directives of PROD stage into 1, which will produce single layer and save some space; added Dockerfile-dev, docker-compose-dev.yml, and new "dev" and "dev-down" directives into Makefile, which allows to setup development env in Docker. Instructions of how to use it are in comments at the beginning of Dockerfile-dev and docker-compose-dev.yml files

• Set RWX permissions to the application's working folder for any user, so that the image could be later run with non-root permissions and the app still be able to do needed operations in the FS

• Enhanced the "Getting started" section in the readme; added the help target and enhanced comments in the Makefile; commented out the docker system prune -f with the comment about the command and why it is there; added optional and commented by default 7zz commands to the backup section of the Makefile

• Use slim base image for final photoview image

• Implement SQLite support according to the PR chore(docker-compose): add sqlite variable and volumes example photoview/photoview#851

• Removed deprecated version line from compose files; optimized dockerfile to build with less layers and run as non-root; mapped only Photoview related services to Watchtower by default instead of updating all running images on a host; added template for Postgres to the .env; reverted compose executable definition, so the new compose is called when present; added a tip about lnav to help

• fix a typo in the username; add support of PostgreSQL; split and optimize backup target in Makefile

• Fixed some typos and styling in Readme, excluded dev-environment setup from the PR; added a list of tips on how to secure Photoview in the Advanced setup section of Readme

• Implemented many security improvements, suggested by @Omar007, switched to the dedicated Darktable's repo to install the latest released version, as asked in Darktable is out of date on edge docker image photoview/photoview#935; switched Watchtower to labels instead of profiles

• forgot the compose file

• move face models back to /app folder; comment out and document unnecessary vars in compose; fix a typo in a few vars

• Exclude Makefile in the root folder from git; documented multiple mounts case better; fixed incorrect SQLite DB path

• Fixed several bugs after complete testing cycle with all 3 DBs

• removed hardcoded port in Dockerfile

• Pin the major version for the photoview image for stability

• Revert back to the port 80 inside the container on product owner's request

• Provide a minimal compose file and update the readme accordingly

• Handle incorrect media file and folder permissions; set correct permissions for storage folder; fix healthcheck command for postgres

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