Update docs theme

[pavithraes]

Fixes #764

Description

This pull request updates the documentation theme properties with the conda-store theme.

Currently, this is a draft PR to have a preview as we make updates.

Pull request checklist

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

Additional information

Add @smeragoel as a co-author while merging.

How to test

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[smeragoel]

I've made some color updates and currently, there are no accessibility issues detected, except for a minor one in the breadcrumbs. To address this, I recommend the following change:

From:
--ifm-breadcrumb-color-active: var(--ifm-color-primary);

To:
--ifm-breadcrumb-color-active: var(--ifm-color-primary-dark);

Also, I want to update the footer colour:
--ifm-footer-background-color: #242526;

I'm not entirely sure which file needs this adjustment, so I'm hoping you could help out with this, @pavithraes.

Once this change is implemented, I plan to do a final check to ensure everything is in order, and then we should be all set!

[pavithraes]

@smeragoel - The changes you requested are done :)

[smeragoel]

@pavithraes the netlify preview isn't working for me, could you help out?

[pavithraes]

@smeragoel - Preview is available now :)

[smeragoel]

Looks great! There don't seem to be any major accessibility issues, however, I do think we could benefit from an a11y audit down the line.