Add plausible tracking snippet

[pavithraes]

Fixes #408

Description

This pull request:

• Adds plausible tracking snippet as script, ref: https://plausible.io/docs/docusaurus-integration

Pull request checklist

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

Additional information

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[pavithraes]

@trallard - Have you registered the conda-store domain on Plausible? I see the following message when I try to add a website:

This domain cannot be registered. Perhaps one of your colleagues registered it? If that's not the case, please contact support@plausible.io

PR is not blocked by this because the snippet has a standard structure, but it'll be nice to know & verify who has access to the conda-store metrics. :)

[trallard]

Yes I already added it - just need to add the snippet. I think that's why I was confused about whether we enabled it or not

Will add you to it on Plausible