[@portaljs/ckan][xl] - add ckan package and example using it

examples/ckan-ssg/ckan-example/README.md

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+This is a repo intended to serve as an example of a data catalog that get its data from a CKAN Instance.
+
+```
+npx create-next-app <app-name> --example https://github.com/datopian/portaljs/tree/main/examples/ckan-example
+cd <app-name>
+```
+
+- This project uses CKAN as a backend, so you need to point the project to the CKAN Url desired, you can do so by setting up the `DMS` env variable in your terminal or adding a `.env` file with the following content:
+
+```
+DMS=<ckan url>
+```
+
+- Run the app using:
+
+```
+npm run dev
+```
+
+Congratulations, you now have something similar to this running on `http://localhost:4200`
+![](https://media.discordapp.net/attachments/1069718983604977754/1098252297726865408/image.png?width=853&height=461)
+If yo go to any one of those pages by clicking on `More info` you will see something similar to this
+![](https://media.discordapp.net/attachments/1069718983604977754/1098252298074988595/image.png?width=853&height=461)
+
+## Deployment
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https%3A%2F%2Fgithub.com%2Fdatopian%2Fportaljs%2Ftree%2Fmain%2Fexamples%2Fckan-example&env=DMS&envDescription=URL%20For%20the%20CKAN%20Backend%20Ex%3A%20https%3A%2F%2Fdemo.dev.datopian.com)
+
+By clicking on this button, you will be redirected to a page which will allow you to clone the content into your own github/gitlab/bitbucket account and automatically deploy everything.
+
+
+
+## Extra commands
+
+You can also build the project for production with
+
+```
+npm run build
+```
+
+And run using the production build like so:
+
+```
+npm run start
+```
+