Update README.md

Author: mbostock

README.md

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 [**Observable Framework**](https://observablehq.com/framework/) is a free, [open-source](./LICENSE), static site generator for data apps, dashboards, reports, and more. Framework combines JavaScript on the front-end for interactive graphics with any language on the back-end for data analysis. Framework features [data loaders](https://observablehq.com/framework/loaders) that precompute static snapshots of data at build time for dashboards that load instantly.
 
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-  <source media="(prefers-color-scheme: dark)" srcset="https://observablehq.observablehq.cloud/oss-analytics/@observablehq/framework/downloads-dark.svg">
-  <img alt="Daily downloads of Observable Framework" src="https://observablehq.observablehq.cloud/oss-analytics/@observablehq/framework/downloads.svg">
-</picture>
+<a href="https://observablehq.observablehq.cloud/oss-analytics/@observablehq/framework">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://observablehq.observablehq.cloud/oss-analytics/@observablehq/framework/downloads-dark.svg">
+    <img alt="Daily downloads of Observable Framework" src="https://observablehq.observablehq.cloud/oss-analytics/@observablehq/framework/downloads.svg">
+  </picture>
+</a>
 
 <sub>Daily downloads of Observable Framework · [oss-analytics](https://observablehq.observablehq.cloud/oss-analytics/)</sub>