chore: Significantly restructure folder layout

This moves the various projects from "type-based" folders (such as
"services" or "tools") into more appropriate semantic folders (such as
"nix", "ops" or "web").

Deprecated projects (nixcon-demo & gotest) which only existed for
testing/demonstration purposes have been removed.

(Note: *all* builds are broken with this commit)

web/tazblog/src/RSS.hs

@@ -0,0 +1,48 @@
+{-# LANGUAGE RecordWildCards #-}
+
+module RSS
+  ( renderFeed
+    )
+where
+
+import BlogStore
+import Data.Maybe (fromJust)
+import qualified Data.Text as T
+import Data.Time (UTCTime (..), getCurrentTime, secondsToDiffTime)
+import Network.URI (URI, parseURI)
+import Text.RSS
+
+createChannel :: UTCTime -> [ChannelElem]
+createChannel now =
+  [ Language "en",
+    Copyright "Vincent Ambo",
+    WebMaster "mail@tazj.in",
+    ChannelPubDate now
+    ]
+
+createRSS :: UTCTime -> [Item] -> RSS
+createRSS t =
+  let link = fromJust $ parseURI "https://tazj.in"
+   in RSS "tazjin's blog" link "tazjin's blog feed" (createChannel t)
+
+createItem :: Entry -> Item
+createItem Entry {..} =
+  [ Title "tazjin's blog",
+    Link $ entryLink entryId,
+    Description $ T.unpack text,
+    PubDate $ UTCTime edate $ secondsToDiffTime 0
+    ]
+
+entryLink :: EntryId -> URI
+entryLink i =
+  let url = "http://tazj.in/" ++ "/" ++ show i
+   in fromJust $ parseURI url
+
+createItems :: [Entry] -> [Item]
+createItems = map createItem
+
+createFeed :: [Entry] -> IO RSS
+createFeed e = getCurrentTime >>= (\t -> return $ createRSS t $ createItems e)
+
+renderFeed :: [Entry] -> IO String
+renderFeed e = fmap (showXML . rssToXML) (createFeed e)