docs: add frontend development guide for UI customization and navigation

[TalalAhmed31]

As requested in opencti/opencti#12517 , moving this contribution to the official documentation repository.

Proposed changes

• Added a frontend-development-guide file as frontend documentation
• Helps programmers understand the uncommented code and make changes more easily

Related issues

• N/A

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality (documentation build & readability)
• I added/update the relevant documentation (either on github or on notion)

Further comments

• Since the frontend code lacks inline comments, I created this dedicated documentation to help new contributors navigate the codebase efficiently.
• No code logic was modified — this PR is purely documentation-related.

[TalalAhmed31]

Hi @aHenryJard
I’ve updated the guide to remove the hardcoded color values and now reference the constants instead.
Thanks for your helpful feedback — please let me know if any further adjustments are needed.

[TalalAhmed31]

@marieflorescontact Kindly look into this, as I have made all the changes and still awaiting for the response.
CC: @aHenryJard

[marieflorescontact]

Hi @TalalAhmed31 ,

Thank you for your work 🙂
After discussing this with the team, we’ve decided that we cannot accept this documentation in its current form.

The main reason is that it is too focused on low-level code implementation (e.g. static code snippets, very basic examples such as commenting out a field in a query to exclude it, emphasis on theme/logo customization, etc.) and does not bring enough added value at the documentation level.

For the official OpenCTI documentation, we are looking for content that is more oriented towards higher-level guidelines, for example:

How to properly develop a new module;
Which patterns and best practices should be followed;
How to customize or extend components in a consistent way;
Conceptual overviews and diagrams of workflows and architecture.

Thank you again for your contribution and the time you invested in this PR.