Docs: Add instructions for renaming and managing codespaces (closes #229)

[avinab-neogy]

This PR updates the contributor documentation to add a new step for renaming GitHub Codespaces after creation. The new instructions guide users on how to change the codespace display name for easier identification, especially when working on multiple issues or features.

These changes address issue #229.

[hturner]

This is nearly there, but currently only partly resolves #229.

You also need to add a step 5: Turn off auto-delete. This will need a similar screenshot to step 4.

[avinab-neogy]

Hi @hturner ,
I have added a bullet to step 4 itself and not made a separate step 5 for turning off auto-deletion since that would make the tutorial verbose.

[hturner]

Makes sense, thanks, merging in now.