Misc clean-up docs structure

[pavithraes]

N/A

Description

This pull request:

• Removes changelog files
• Removes border around conda-store logo
• Updates "in development" notes, sidebar position, etc. for some files

Pull request checklist

• [x] Did you test this change locally?
• [x] Did you update the documentation (if required)?
• [ ] Did you add/update relevant tests for this change (if required)? N/A

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