Use eleventyImport to control rebuilds of tag, blog, and feed pages

src/blog/index.html

@@ -5,6 +5,8 @@ pagination:
     data: collections.posts
     size: 5
     reverse: true
+eleventyImport:
+    collections: ["posts"]
 ---
 <main class="wrapper-lg stack-xl">
     <h1>Blog posts</h1>

src/blog/tag.html

@@ -14,6 +14,9 @@
             "atom": "{{ page.url }}atom.xml",
             "json": "{{ page.url }}feed.json"
         }
+    },
+    "eleventyImport": {
+        "collections": ["tags", "posts"]
     }
 }
 ---