Switch to react

Under the hood, preact is used to reduce dependency size. We still don't
have a build stage, so htm is used instead of JSX.

package-lock.json

@@ -72,6 +72,11 @@
       "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
       "dev": true
     },
+    "htm": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/htm/-/htm-3.0.4.tgz",
+      "integrity": "sha512-VRdvxX3tmrXuT/Ovt59NMp/ORMFi4bceFMDjos1PV4E0mV+5votuID8R60egR9A4U8nLt238R/snlJGz3UYiTQ=="
+    },
     "http-proxy": {
       "version": "1.18.1",
       "resolved": "https://registry.npmjs.org/http-proxy/-/http-proxy-1.18.1.tgz",
@@ -151,6 +156,11 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "preact": {
+      "version": "10.4.4",
+      "resolved": "https://registry.npmjs.org/preact/-/preact-10.4.4.tgz",
+      "integrity": "sha512-EaTJrerceyAPatQ+vfnadoopsMBZAOY7ak9ogVdUi5xbpR8SoHgtLryXnW+4mQOwt21icqoVR1brkU2dq7pEBA=="
+    },
     "qs": {
       "version": "6.9.4",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.9.4.tgz",