docs: Rebase Work Instruction

[SteveDala]

Description

The added document is a complete rebase guide for moving completed work on either doubtfire-api or doubtfire-web from the 9.x development branch to the 10.0.x branch.

Type of change

• Documentation (update or new)

Testing Checklist

• Have run npm run format See docs: npm run format #164.
• Have run npm run build
• Have run npm run dev and/or npm run preview, using:
  • Chrome
  • Safari
  • Firefox

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have requested a review from the documentation team on the Pull Request

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[31Husain31]

This is really helpful documentation - I can tell a lot of effort went into this! The step-by-step walkthrough with screenshots is great for people who haven't done rebasing before.
A few observations:
Structure:

The progression from simple to complex (API rebase → Web rebase) makes sense
Love the use of actual examples (Sahiru's Staff Grant Extension work)

Technical content:

The Gemfile/package.json comparison is spot-on - helps people understand the Ruby/Node parallels
Good call on warning about schema.rb - that's a common gotcha
The section about missing features from 9.x (like LearningAlignmentApi) is practical

Overall this fills a real gap in the documentation. The screenshots especially make it much less intimidating for newcomers.