Add Sourcehut Pages as deployment platform (#1365)

docs/content/documentation/deployment/sourcehut.md

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+title = "Sourcehut Pages"
+weight = 15
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+
+Deploying your static Zola website on [Sourcehut Pages][srht] is very simple.
+
+You only need to create a manifest `.build.yml` file in your root folder of your Zola project and push your changes to the Sourcehut git/hg repository. To create your `.build.yml` you can start by [a template][srht-tpl].
+
+Example:
+
+``` yaml
+image: alpine/edge
+packages: [ zola ]
+oauth: pages.sr.ht/PAGES:RW
+environment:
+  site: www.example.org
+sources:
+  - https://git.sr.ht/~your_username/my-website
+tasks:
+  - build: |
+      cd my-website
+      zola build
+  - package: |
+      cd my-website
+      tar -C public -cvz . > ../site.tar.gz
+  - upload: |
+      acurl -f https://pages.sr.ht/publish/$site -Fcontent=@site.tar.gz
+```
+
+This manifest will checkout your code from `sources`, build and upload the generated static files to `site` using a wrapper script around `curl` (called `acurl`, already available in all Sourcehut builds).
+
+From this template you need to customize the variable `site` with the domain that will host your website and `sources` to point to your Sourcehut git/hg public URL (in this example `my-website` is the name of the repository).
+
+Then commit and push your changes:
+
+``` sh
+$ git push
+Enumerating objects: 5, done.
+...
+remote: Build started:
+remote: https://builds.sr.ht/~your_username/job/430625 [.build.yml]
+To git.sr.ht:~your_username/www
+   fbe9afa..59ae556  master -> master
+```
+
+The build job will be automatically triggered. Notice that Sourcehut returns a direct link to the build page.
+
+By default you can use a subdomain of Sourcehut Pages to host your static website (e.g. "your_username.srht.site"). If you want to use a custom domain (e.g. "blog.mydomain.org"), you will need to configure a DNS record to point to the Sourcehut server. Instructions to do this are detailed on [Sourcehut][srht-custom-domain].
+
+[srht]: https://srht.site
+[srht-tpl]: https://git.sr.ht/~sircmpwn/pages.sr.ht-examples
+[srht-custom-domain]: https://srht.site/custom-domains