remove unused packages and move dev deps accordingly

package.json

@@ -35,7 +35,7 @@
     "@typescript-eslint/eslint-plugin": "^4.29.2",
     "@typescript-eslint/parser": "^4.29.2",
     "@vitejs/plugin-legacy": "^1.6.1",
-    "autoprefixer": "^10.2.6",
+    "autoprefixer": "^10.4.0",
     "cheerio": "^1.0.0-rc.3",
     "commander": "^6.0.0",
     "core-js": "^3.6.5",
@@ -44,32 +44,28 @@
     "finalhandler": "^1.1.1",
     "impunity": "^1.0.9",
     "mdn-polyfills": "^5.20.0",
-    "postcss": "^8.1.1",
     "postcss-css-variables": "^0.17.0",
     "postcss-flexbugs-fixes": "^4.2.1",
-    "postcss-import": "^12.0.1",
-    "postcss-url": "^8.0.0",
     "regenerator-runtime": "^0.13.7",
     "rollup-plugin-cleanup": "^3.1.1",
     "serve-static": "^1.13.2",
-    "snowpack": "^3.8.3",
     "typescript": "^4.3.5",
-    "xxhashjs": "^0.2.2"
-  },
-  "dependencies": {
-    "@matrix-org/olm": "https://gitlab.matrix.org/api/v4/projects/27/packages/npm/@matrix-org/olm/-/@matrix-org/olm-3.2.3.tgz",
+    "xxhashjs": "^0.2.2",
+    "vite": "^2.6.14",
+    "rollup": "^2.26.4",
     "@rollup/plugin-commonjs": "^15.0.0",
     "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
+    "node-html-parser": "^4.0.0"
+  },
+  "dependencies": {
+    "@matrix-org/olm": "https://gitlab.matrix.org/api/v4/projects/27/packages/npm/@matrix-org/olm/-/@matrix-org/olm-3.2.3.tgz",
     "aes-js": "^3.1.2",
     "another-json": "^0.2.0",
     "base64-arraybuffer": "^0.2.0",
     "bs58": "^4.0.1",
     "dompurify": "^2.3.0",
     "es6-promise": "https://github.com/bwindels/es6-promise.git#bwindels/expose-flush",
-    "node-html-parser": "^4.0.0",
-    "rollup": "^2.26.4",
-    "text-encoding": "^0.7.0",
-    "vite": "^2.6.3"
+    "text-encoding": "^0.7.0"
   }
 }