chore: Improve Renovate config

* Move under `.github/` to reduce amount of top-level files.
* Convert to JSON5 to allow comments and trailing commans.
* Include `js-sys` and `web-sys` in `wasm-bindgen` group.

.github/renovate.json5

@@ -0,0 +1,37 @@
+{
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    "extends": ["config:base"],
+    // Package rules are matched such that later rules override earlier ones.
+    "packageRules": [
+        {
+            "matchLanguages": ["rust"],
+            "matchUpdateTypes": "patch",
+            "groupName": "Rust dependency patches",
+            "extends": ["schedule:weekly"],
+        },
+        {
+            "matchLanguages": ["rust"],
+            "groupName": "Rust dependencies",
+            "extends": ["schedule:weekly"],
+        },
+        {
+            "matchPackageNames": ["wasm-bindgen", "js-sys", "web-sys", "wasm-bindgen-futures"],
+            "groupName": "wasm-bindgen",
+        },
+        // Disable `tracing-tracy` updates (needed although it's pinned in `desktop/Cargo.toml`).
+        {
+            "matchPackageNames": ["tracing-tracy"],
+            "enabled": false,
+        },
+        {
+            "matchLanguages": ["js"],
+            "groupName": "Node.js dependencies",
+            "extends": ["schedule:monthly"],
+        },
+        {
+            "matchManagers": ["github-actions"],
+            "groupName": "Github Actions dependencies",
+            "extends": ["schedule:monthly"],
+        },
+    ]
+}

renovate.json

@@ -1,36 +0,0 @@
-{
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:base"
-  ],
-  "packageRules": [
-    {
-      "matchLanguages": ["rust"],
-      "matchUpdateTypes": "patch",
-      "groupName": "Rust dependency patches",
-      "extends": ["schedule:weekly"]
-    },
-    {
-      "matchLanguages": ["rust"],
-      "extends": ["schedule:weekly"]
-    },
-    {
-      "matchPackageNames": ["wasm-bindgen", "wasm-bindgen-futures"],
-      "groupName": "Rust dependencies - wasm-bindgen related"
-    },
-    {
-      "matchLanguages": ["js"],
-      "groupName": "Node.js dependencies",
-      "extends": ["schedule:monthly"]
-    },
-    {
-      "matchManagers": ["github-actions"],
-      "groupName": "Github Actions dependencies",
-      "extends": ["schedule:monthly"]
-    },
-    {
-      "matchPackageNames": ["tracing-tracy"],
-      "enabled": false
-    }
-  ]
-}