Adds some help of permanent redirects

.header.md

@@ -205,10 +205,34 @@ You may now edit Wordpress as you would normally, customize your site as you lik
 section of the WP2Static plugin, and click the 'Generate Static Site' button. This will take some minutes depending on
 the size of your site. When complete the site will be published in S3, and available via the public URL configured
 in your module definition.
-
+  cloudfront_function_301_redirects = {
+    # Old category pages
+    "^\\/(pre-historia)$": "/categoria/$1/",
 Gentle reminder that no backup options are currently bundled with this module - the most effective means would be to
 generate and retain a backup from within Wordpress for maximum flexibility. We recommend the UpdraftPlus plugin.
 
+## Permanent Redirects
+
+Basic url path based permanent redirects are supported via the CloudFront function. The variable `cloudfront_function_301_redirects` can be set with a custom map of match to destination mappings.
+
+Some aspects that need to be taken into consideration for the match:
+
+* It's a regular expression
+* Group replacements are supported
+* Runs in a Javascript function, escaping needs to be taken into consideration
+* Passed through a TF var, so escaping that needs to be taking into account as well
+
+An example to match a path like `/category-name`, a suitable match would be `"^\\/(category-name)$"`. Breaking down the `\\/` part, the first `\` tells TF to escape the second `\`, which is the Regex escape for the `/` character.
+
+An example:
+
+```
+cloudfront_function_301_redirects = {
+  # Redirects /travel to /category/travel/
+  "^\\/(travel)$": "/category/$1/",
+}
+```
+
 ## Troubleshooting
 
 If you experience issues with the publish element of WP2Static, you can retry. It can be more reliable to proceed to