docs: add zk-graph-view to related projects section

Author: cyberSapoPerro

README.md

@@ -165,3 +165,5 @@ Here you can read
   a similar purpose
 - [zk-spaced](https://github.com/matze/zk-spaced) – spaced repetition plugin for
   zk
+- [zk-graph-view](https://github.com/cyberSapoPerro/zk-graph-view) -
+interactive graph visualization plugin for zk

docs/tips/graph-visualization.md

@@ -0,0 +1,7 @@
+# Graph Visualization
+
+## zk-graph-view
+
+[zk-graph-view](https://github.com/cyberSapoPerro/zk-graph-view) is an
+interactive graph visualization plugin for zk, allowing you to explore your
+note connections visually.

docs/tips/index.rst

@@ -13,5 +13,6 @@ Tips
    editors-integration
    future-proof
    static-sites
+   graph-visualization
    style