Include pylinter and make code compatible, codeql findings

[m-1-k-3]

• included a pylinter check in check_project.sh
• started with some first cleanup tasks to make the code pylinter compatible started rating: 5.58/10 current rating: 9.52/10
• CodeQL issues are fixed
• as the docker mode of emba is currently not supported we have disabled it in the UI
• SECRET_KEY is moved to .env and auto-generated from installer script (old and insecure default key is used for build scripts)
• web.log is not needed anymore for build checks
• Moved redis to port 7777 (we do not conflict with cve-search anymore)
• if empty database show "no data" in mainDashboard
• emba command is now included in the overview of a scan