docs: update website for release (#1449)

* docs: update website dependencies

* docs: don't promote css-size
We don't maintain the package and I am not sure it's reliable.

* docs: keep input and output editors at 50% each.

* docs: prevent shaking during playground load

site/package.json

@@ -7,26 +7,26 @@
     "build": "eleventy --input src/"
   },
   "dependencies": {
-    "@codemirror/autocomplete": "^6.1.0",
-    "@codemirror/commands": "^6.0.1",
-    "@codemirror/lang-css": "^6.0.0",
-    "@codemirror/language": "^6.2.1",
-    "@codemirror/state": "^6.1.1",
-    "@codemirror/view": "^6.2.0",
+    "@codemirror/autocomplete": "^6.3.0",
+    "@codemirror/commands": "^6.1.2",
+    "@codemirror/lang-css": "^6.0.1",
+    "@codemirror/language": "^6.3.0",
+    "@codemirror/state": "^6.1.2",
+    "@codemirror/view": "^6.4.0",
     "cssnano-preset-advanced": "../packages/cssnano-preset-advanced",
     "cssnano-preset-default": "../packages/cssnano-preset-default",
     "cssnano-preset-lite": "../packages/cssnano-preset-lite",
     "os-browserify": "^0.3.0",
     "path-browserify": "^1.0.1",
-    "postcss": "^8.4.16"
+    "postcss": "^8.4.18"
   },
   "devDependencies": {
-    "@11ty/eleventy": "^1.0.1",
+    "@11ty/eleventy": "^1.0.2",
     "@11ty/eleventy-plugin-syntaxhighlight": "^4.1.0",
     "@iarna/toml": "^2.2.5",
     "cssnano": "../packages/cssnano/",
     "markdown-it": "^13.0.1",
-    "markdown-it-anchor": "^8.6.4",
+    "markdown-it-anchor": "^8.6.5",
     "webpack": "^5.74.0",
     "webpack-cli": "^4.10.0"
   }