Update metadata on landing page

[pavithraes]

Description

This pull request:

• Updates the title and description metadata used in the conda-store landing page, which also propogates to open-graph cards used in Slack, social, etc.

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

How to test

Use the preview link: https://deploy-preview-774--kaleidoscopic-dango-0cf31d.netlify.app, on Slack or elsewhere. Inspect the preview for accurate og:title & og:descripton

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[dharhas]

The favicon is also missing from the card as well. Not sure where that gets picked up from. It works for the nebari website.

[pavithraes]

The favicon is also missing from the card as well. Not sure where that gets picked up from. It works for the nebari website.

I looked into this for a few minutes, but I couldn't find where the issue was. I've opened #788 to track this so that we can unblock this PR for now.