[#81] Update the project to use the up-to-date versions

What happened 👀

Upgrade to Ruby to 3.0.6 - we had an issue when running the latest one due to the figaro gem
Upgrade to Rails to 7
Upgrade to Node 18
Drop Webpacker, change to use esbuild for JS and sass, postcss for CSS
Replace scss-lint with stylelint
Add sprockets-rails to load files in Rails
Introduce Makefile and update README

Rails 7 doesn't support Webpacker, which was why we need to use other tools
Add sprockets-rails back to compile gem stylesheets, and also it helps load other files (images, fonts, SVGs)
Move all devDependencies to dependencies to use them in Dockerfile
Add .yarnrc in .yarnrc to allow install the current @nimblehq/stylelint-config-nimble as it doesn't support the latest node.
Create the Makefile to reduce the step to develop. We also refactor files to make the development faster.
In make test, we use the different Docker containers with dev as isolating the container is better IMO. And it can help us in case we didn't start the dev containers, then it could use the test containers separately.
Add volumes to docker-compose.dev.yml to persist data on localhost.

Deployed and tested on Staging:

	2 Warnings
:warning:	app/controllers/api/v1/surveys_controller.rb#L8 - Remove unused methods (api::v1::surveyscontroller#index)
:warning:	app/controllers/api/v1/surveys_controller.rb#L16 - Remove unused methods (api::v1::surveyscontroller#show)