Document webserver deployment for #929 (#932)

docs/workflow/deploy.md

@@ -12,7 +12,19 @@ reviewed: 18/10/20
 
 \lineskip
 
-Deploying the website is trivial on GitHub, Gitlab and services like Netlify.
+Deploying the website is trivial on an existing webserver, via GitHub or Gitlab, or on services like Netlify.
+
+## Deploying on an existing webserver
+
+The contents of the `__site` folder can simply be deployed to a path on an existing server as follows.
+Supposing you wish your site to appear at `http://my.example.com/path/to/my/franklin/site/`.  You would take the following steps:
+
+* Prepare the `__site` directory by running `optimize( prepath='/path/to/my/franklin/site/', minify = false )`.
+Franklin.jl does not use relative links, so this step is needed to ensure that the links between site elements are correct. (The `minify = false` argument is optional but is currently recommended.)
+
+* Copy the contents of the `__site` directory to the target location using your chosen method (for example, using [rsync](https://en.wikipedia.org/wiki/Rsync)).
+
+Your site should now be live, with the index page appearing at `http://my.example.com/path/to/my/franklin/site/index.html`.
 
 ## Deploying on GitHub