Docs: improved mermaid diagram for better visibility. Add "MaheshG11" as contributor

[MaheshG11]

Proposed Commit Message

docs: Adjust arrow color in Mermaid diagrams for improved visibility; Add "MaheshG11" as Contributor

Changed the color of arrows in Mermaid diagrams to enhance visibility
in both dark and light mode themes. This change ensures that the diagrams
are readable regardless of the viewing mode.

Fixes issue #5837 

Fixes issue #5837

Additional Context

1. Modified the lineColor property of arrows for all mermaid diagrams in the documentation to a neutral color that stands out in both dark and light modes.
2. Added "MaheshG11" to tools/.github-cla-signers.
3. IMPORTANT: Changed the order in conf.py file, this was done because it was giving import errors on running build commands.

Test Steps

Only for Linux/Unix Operating systems

1. In the main repo cd doc/rtd
2. Run sphinx-build -b html . build/html
3. Run xdg-open build/html/index.html. This should open up browser with the local build.
4. In browser you will be on /index.html. Navigate to /explanation/boot.html. Here you will find changes that were made by this commit.

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number ([docs]: Arrows are hard to see in the boot stage diagram on dark mode #5837 )