Refactor Developer Portal Pages wrt to containers, orchestration, startup and templates

docker configurations for VSCode and Pycharm should use ska-cicd-makefile targets update developer portal with skeleton projects for directory structure continuous integration page and example pipeline file should be replaced with makefile and templates container cheatsheet should be updated with makefile targets and examples of using makefile target variables (and help, long-help) uploading docker to nexus (src/tools/containers/uploading-docker-nexus.rst) file should use latest makefile examples Access to OpenStack platform section should be deleted? dev-faq page should be refactored completely with new questions, existing ones should be amended to use makefile, templates, deploy-minikube software package release file feels too convoluted, it should be restructured and the wording should be series of steps that can be followed to package an artefact and release it. Other pages that describe similar steps should be also identified and restructured (some pages are describing both the philosophy and how it should be done, i.e. git, ci/cd, containers). The distinction should be clear.