feat: node info, build info and acrylic web theme

Squash of recent dev work: return_session login, backend switcher, line
detail timeline, overview strips, node platform/country/ISP info with flags
and icons, build info (version, tag, time) behind site.show_build, and the
acrylic display theme.

web/package-lock.json

@@ -10,7 +10,11 @@
       "workspaces": [
         "display",
         "admin"
-      ]
+      ],
+      "dependencies": {
+        "flag-icons": "^7.5.0",
+        "simple-icons": "^16.34.0"
+      }
     },
     "admin": {
       "name": "monitor-admin",
@@ -998,6 +1002,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/flag-icons": {
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/flag-icons/-/flag-icons-7.5.0.tgz",
+      "integrity": "sha512-kd+MNXviFIg5hijH766tt+3x76ele1AXlo4zDdCxIvqWZhKt4T83bOtxUOOMlTx/EcFdUMH5yvQgYlFh1EqqFg==",
+      "license": "MIT"
+    },
     "node_modules/flat-cache": {
       "version": "6.1.23",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-6.1.23.tgz",
@@ -2089,6 +2099,25 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/simple-icons": {
+      "version": "16.34.0",
+      "resolved": "https://registry.npmjs.org/simple-icons/-/simple-icons-16.34.0.tgz",
+      "integrity": "sha512-UTxKn0PVspk84B2hHF3Dqiqht1yDjJmDc/t4cO7PyCQxCMk6OjEu95pnpGjhLaGeQ4qBrGASbefTIe/+czrX7g==",
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/simple-icons"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/simple-icons"
+        }
+      ],
+      "license": "CC0-1.0",
+      "engines": {
+        "node": ">=0.12.18"
+      }
+    },
     "node_modules/slash": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",