[Documentation] "Develop" page

[devtobi]

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Problem description (optional)

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Desired solution

We want to provide a information page on how to develop using the refarch templates. This .e.g includes:

• Explaination of the development docker stack and include links to directly land on development UIs
• Short overview of included CI/CD configurations (workflows and actions) => reference external documentation
• Explanation of CODEOWNERS file
• Explain tooling for Pull Requests (CodeRabbit configuration, CodeQL, Dependency Review, suggested push rule settings)
• Explain tooling for LCM and quality safety (Renovatebot)
• Explain development stuff for each template (npm scripts and reference to external tools (e.g. Vite, Vitest, Vue DevTools, PatternLab, Linters, and more, ...), AppSwitcher UI for local setup, vue devtools usage and LAUNCH_EDITOR env variable, maven commands, flyway usage, ...)

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