chore: Add Partykit as part of the deployment.

[nickytonline]

1. Run npx partykit@latest token generate to generate a token.
2. Run ntl env:set PARTYKIT_LOGIN nickytonline to add it to the environment variables for Netlify deploys.
3. Run ntl env:set PARTYKIT_TOKEN THE_GENERATED_SUPER_SECRET_TOKEN to add it to the environment variables for Netlify deploys.
4. Run ntl env:set PUBLIC_PARTYKIT_HOST https://astro-partykit-starter-party.nickytonline.partykit.dev so that the production URL for Partykit is available for the deployment.
5. Need to run partykit deploy as part of the deployment.

https://github.com/nickytonline/astro-partykit-starter/blob/f8f7cbb7d9f52c0d861e0027ef67661bffb1a6a7/package.json#L8

-  "build": "astro check && astro build",
+  "build": "astro check && astro build && partykit deploy",

6. Update the code for getting the Partykit URL to the following in https://github.com/nickytonline/astro-partykit-starter/blob/f8f7cbb7d9f52c0d861e0027ef67661bffb1a6a7/src/components/Party.tsx#L5

- const host = import.meta.env.PUBLIC_PARTYKIT_HOST ?? "localhost:1999";
+ const isProd = import.meta.env.PROD;
+ const host = isProd ? import.meta.env.PUBLIC_PARTYKIT_HOST : "localhost:1999";

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[nickytonline]

I've already done steps 1-4 as they are environment variables for continuous integration/continuous deployment (CI/CD) on Netlify that don't involve code changes.

I'll get to steps 5 and 6 in the next few days (post snowboarding) unless @adiati98, you'd like to make those changes. If so, feel free to assign yourself and unassign me.

[adiati98]

Taking it over, @nickytonline. 👍

Adding myself as an assignee and leave yours as is.😉