docs: add description and default permissions for team manager role

[Mahesh-Nandigam]

Hi! This PR fixes #1076 by documenting the missing Team Manager role and adding its default permissions.

Here is what I've changed:

1. Added the Team Manager role description card to team-roles.md.
2. Linked the Team Manager card header in the roles index page (_index.md) to the default permissions page.
3. Added the Team Manager column to keys.csv and keys-backup.csv. The permissions mirror the Team Admin role but without the ability to delete teams.

Here are the before and after screenshots for review:

Default Team Roles Page:

• Before (Only Team Administrator listed):

• After (Both Team Administrator and Team Manager listed):

Default Permissions Table:

• Before (No column for Team Manager):

• After (Team Manager column added):

Let me know if this looks good. Closes #1076

[gemini-code-assist]

Code Review

This pull request introduces the 'Team Manager' role across the documentation and authorization configuration. Specifically, it adds details for the 'Team Manager' role in the roles documentation and updates the authorization CSV files (keys.csv and keys-backup.csv) to include permissions for this new role. The feedback highlights a typo in the column headers of keys.csv ('Leaner' instead of 'Learner') and suggests minor grammatical and casing corrections in the 'Team Manager' role documentation to ensure consistency.

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[github-actions]

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[Bhumikagarggg]

@Mahesh-Nandigam Thank you for your contribution! Let's discuss this during the website call tomorrow at 5:30 PM IST | 7 AM CST Add it as an agenda item to the meeting minutes, if you would 🙂

[Mahesh-Nandigam]

Hi @Bhumikagarggg, thank you! I have my college lab external exam tomorrow, so I won't be able to join the call this week. I would love to join next week's call instead to discuss the PR! I will add it to the minutes for next week.