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)

services/tazblog/src/RSS.hs

@@ -1,48 +0,0 @@
-{-# 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)