add regenerate command

doc/comitium.1.scd

@@ -23,6 +23,10 @@ variety of feed formats:
 *refresh* [_FLAGS_]
 	Check for new updates to subscriptions and update aggregator page.
 
+*regenerate*
+	Will regenerate all the files created by comitium using cached entries
+	without fetching any feeds.
+
 *add* [_FLAGS_] <_LINK_> [_TITLE_]
 	Add a new subscription. _LINK_ is a link to the feed or watched URL.
 	_TITLE_ is an optional title for the feed, otherwise a title will be
@@ -30,6 +34,9 @@ variety of feed formats:
 	first heading on a page is used as a title. For ATOM, RSS, and JSON feeds,
 	the provided title is used. For a page being watched for changes, the URL
 	itself is used.
+	Also to note: when adding a new subscription, you *do not* need to run
+	*refresh* afterwards, *add* will automatically fetch the entries and
+	regenerate the .gmi and .json files.
 
 *remove* <_LINK_>
 	Remove a subscription at _LINK_.