help: Make canonical URL for the root to be /help/.

We also make sure that /help/ is accessible when using the dev server.

We add vite as a dependency. v7 of vite is the latest version but using
that causes type problems for PluginOptions since astro uses vite v6.
Therefore we pin vite to v6 for now.

This commit also runs `pnpm dedupe` for `tinyglobby` pinning it to
0.2.15 instead of the previous 0.2.14 in the lockfile.

pnpm-lock.yaml

@@ -513,6 +513,9 @@ importers:
       typescript-eslint:
         specifier: ^8.13.0
         version: 8.42.0(eslint@9.34.0(jiti@2.5.1))(typescript@5.9.2)
+      vite:
+        specifier: ^6.3.5
+        version: 6.3.5(@types/node@22.18.1)(jiti@2.5.1)(terser@5.44.0)(yaml@2.8.1)
       vnu-jar:
         specifier: ^24.10.17
         version: 24.10.17
@@ -8865,8 +8868,8 @@ packages:
   tinyexec@1.0.1:
     resolution: {integrity: sha512-5uC6DDlmeqiOwCPmK9jMSdOuZTh8bU39Ys6yidB+UTt5hfZUPGAypSgFRiEp+jbi9qH40BLDvy85jIU88wKSqw==}
 
-  tinyglobby@0.2.14:
-    resolution: {integrity: sha512-tX5e7OM1HnYr2+a2C/4V0htOcSQcoSTH9KgJnVvNm5zm/cyEWKJ7j7YutsH9CxMdtOkkLFy2AHrMci9IM8IPZQ==}
+  tinyglobby@0.2.15:
+    resolution: {integrity: sha512-j2Zq4NyQYG5XMST4cbs02Ak8iJUdxRM0XI5QyxXuZOzKOINmWurp3smXu3y5wDcJrptwpSjgXHzIQxR0omXljQ==}
     engines: {node: '>=12.0.0'}
 
   tinyqueue@2.0.3:
@@ -13008,7 +13011,7 @@ snapshots:
       shiki: 3.12.2
       smol-toml: 1.4.2
       tinyexec: 0.3.2
-      tinyglobby: 0.2.14
+      tinyglobby: 0.2.15
       tsconfck: 3.1.6(typescript@5.9.2)
       ultrahtml: 1.6.0
       unifont: 0.5.2
@@ -20388,7 +20391,7 @@ snapshots:
 
   tinyexec@1.0.1: {}
 
-  tinyglobby@0.2.14:
+  tinyglobby@0.2.15:
     dependencies:
       fdir: 6.5.0(picomatch@4.0.3)
       picomatch: 4.0.3
@@ -20964,7 +20967,7 @@ snapshots:
       picomatch: 4.0.3
       postcss: 8.5.6
       rollup: 4.50.0
-      tinyglobby: 0.2.14
+      tinyglobby: 0.2.15
     optionalDependencies:
       '@types/node': 22.18.1
       fsevents: 2.3.3