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/cgit/config.yaml

@@ -0,0 +1,73 @@
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: gcsr-secrets
+type: Opaque
+data:
+  username: "Z2l0LXRhemppbi5nbWFpbC5jb20="
+  # This credential is a GCSR 'gitcookie' token.
+  password: '{{ passLookup "gcsr-tazjin-password" | b64enc }}'
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: cgit
+  labels:
+    app: cgit
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: cgit
+  template:
+    metadata:
+      labels:
+        app: cgit
+    spec:
+      securityContext:
+        runAsUser: 1000
+        runAsGroup: 1000
+        fsGroup: 1000
+      containers:
+      - name: cgit
+        image: nixery.local/shell/services.cgit-taz:{{ gitHEAD }}
+        command: [ "cgit-launch" ]
+        env:
+          - name: HOME
+            value: /git
+        volumeMounts:
+          - name: git-volume
+            mountPath: /git
+      - name: sync-gcsr
+        image: nixery.local/shell/services.sync-gcsr:{{ gitHEAD }}
+        command: [ "sync-gcsr" ]
+        env:
+          - name: SYNC_USER
+            valueFrom:
+              secretKeyRef:
+                name: gcsr-secrets
+                key: username
+          - name: SYNC_PASS
+            valueFrom:
+              secretKeyRef:
+                name: gcsr-secrets
+                key: password
+        volumeMounts:
+          - name: git-volume
+            mountPath: /git
+      volumes:
+        - name: git-volume
+          emptyDir: {}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: cgit
+spec:
+  selector:
+    app: cgit
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 8080