Upgrade to GitHub-native Dependabot (#159)

.github/dependabot.yml

@@ -0,0 +1,25 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "11:00"
+  open-pull-requests-limit: 99
+  ignore:
+  - dependency-name: tailwindcss
+    versions:
+    - 2.1.1
+    - 2.1.2
+  - dependency-name: postcss
+    versions:
+    - 8.2.10
+    - 8.2.12
+    - 8.2.6
+    - 8.2.8
+    - 8.2.9
+  - dependency-name: cssnano
+    versions:
+    - 4.1.11
+    - 5.0.0
+    - 5.0.1