[PR]: Add Analytics and vercel setup.

[LuchoTurtle]

fixes #13

I couldn't get nextra-demo to publish to Github Pages because it's not a fully static website (it has middleware.ts for authentication) - see https://nextjs.org/docs/app/building-your-application/deploying/static-exports#unsupported-features.
So, I created a fork and deployed it to my personal Vercel account.

I know we can't deploy on Vercel as dwyl because you have to pay to be able to do it because this repo is inside an organization. But I believe this is going to be a pain to keep the Vercel site updated while PRs are being made to this repo, because my fork https://github.com/LuchoTurtle/nextra-demo will only be updated when PRs are pushed into its main.

I digress.

This works (I inclusively tested on localhost with https://analytics.dwyl.com and it's working fine).

To appear on https://analytics.dwyl.com, we have to add nextra-demo-seven.vercel.app as a site to it and it will start tracking (after I deploy the site with these changes on my end once this PR is merged).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (99e55db) to head (e5d5b00).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #14   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          211       211           
  Branches        30        30           
=========================================
  Hits           211       211           

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[nelsonic]

@LuchoTurtle we won't need to update your fork very often. Thanks for deploying it. ✅

[nelsonic]

Thanks @LuchoTurtle 👌

[LuchoTurtle]

https://analytics.dwyl.com/nextra-demo-seven.vercel.app

Working as expected ✅

[nelsonic]

Thanks @LuchoTurtle. Added the link to the deployed app to the repo. ✅