chore: migrate to Tailwind CSS v4, upgrade Astro, add Dependabot configuration, and update project metadata.

Author: kanywst

.github/dependabot.yml

@@ -0,0 +1,68 @@
+version: 2
+updates:
+  # GitHub Actions used by all workflows
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:00"
+      timezone: Etc/UTC
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "chore(actions)"
+
+  # Astro web app
+  - package-ecosystem: npm
+    directory: /web
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:00"
+      timezone: Etc/UTC
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "chore(web)"
+    groups:
+      astro:
+        patterns:
+          - "astro"
+          - "@astrojs/*"
+      tailwind:
+        patterns:
+          - "tailwindcss"
+          - "@tailwindcss/*"
+
+  # Python dependencies — one entry per track
+  - package-ecosystem: pip
+    directory: /tracks/ietf-wimse
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:00"
+      timezone: Etc/UTC
+    open-pull-requests-limit: 3
+    commit-message:
+      prefix: "chore(ietf-wimse)"
+
+  - package-ecosystem: pip
+    directory: /tracks/oauth-wg
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:00"
+      timezone: Etc/UTC
+    open-pull-requests-limit: 3
+    commit-message:
+      prefix: "chore(oauth-wg)"
+
+  - package-ecosystem: pip
+    directory: /tracks/openid
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:00"
+      timezone: Etc/UTC
+    open-pull-requests-limit: 3
+    commit-message:
+      prefix: "chore(openid)"

web/astro.config.mjs

@@ -1,13 +1,9 @@
 import { defineConfig } from "astro/config";
-import tailwind from "@astrojs/tailwind";
-
-const repoBase = process.env.PAGES_BASE ?? "";
 
 export default defineConfig({
   site: process.env.PAGES_SITE ?? "https://example.github.io",
-  base: repoBase,
+  base: process.env.PAGES_BASE ?? "",
   output: "static",
-  integrations: [tailwind()],
   markdown: {
     syntaxHighlight: "shiki",
     shikiConfig: { theme: "github-light" },