docs: add version label to navbar (#186)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

docs/src/version-label.ts

@@ -0,0 +1,23 @@
+import ExecutionEnvironment from "@docusaurus/ExecutionEnvironment";
+
+if (ExecutionEnvironment.canUseDOM) {
+  function readVersionFile() {
+    return fetch(
+      "https://raw.githubusercontent.com/stonith404/pocket-id/refs/heads/main/.version"
+    )
+      .then((response) => response.text())
+      .catch((error) => `Error reading version file: ${error}`);
+  }
+
+  function getVersion() {
+    readVersionFile()
+      .then((version) => {
+        const versionLabels = document.querySelectorAll('[href="#version"]');
+        versionLabels.forEach((label) => {
+          (label as HTMLElement).innerText = `v${version}`;
+        });
+      })
+      .catch((error) => console.error("Error fetching version:", error));
+  }
+  window.addEventListener("load", getVersion);
+}