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)

ops/infra/kubernetes/tazblog/config.yaml

@@ -0,0 +1,34 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: tazblog
+  labels:
+    app: tazblog
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: tazblog
+  template:
+    metadata:
+      labels:
+        app: tazblog
+    spec:
+      containers:
+      - name: tazblog
+        image: nixery.local/shell/services.tazblog:{{ gitHEAD }}
+        command: [ "tazblog" ]
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: tazblog
+spec:
+  type: NodePort
+  selector:
+    app: tazblog
+  ports:
+    - protocol: TCP
+      port: 8000
+      targetPort: 8000