chore: add git-cliff configuration

feat(release): implement incremental changelog and versioned release workflow

- Generate changelog from previous release tag to HEAD
- Replace full-history changelog with incremental git-cliff usage
- Add automatic version bump from date-based tag
- Commit and push version updates (package.json and lockfile)
- Refactor workflow order to align changelog, versioning, and build
- Improve Node setup and add version checks
- Introduce cliff.toml configuration for grouped changelog output
- Add generated version.json for runtime version display
- Update footer layout to include dynamic version and release link

Signed-off-by: Alexander Lyall <alex@adcm.uk>

src/generated/version.json

@@ -0,0 +1,4 @@
+{
+  "version": "dev",
+  "url": "#"
+}

src/layouts/BaseLayout.astro

@@ -64,13 +64,10 @@ const { title = "Computing:Box" } = Astro.props;
               <a href="/legal-code" style="margin-left: 32px; color: var(--muted); text-decoration: underline;">Legal Code</a>
           </div>
         <div>Computer Science Concept Simulators</div>
-          <div>
-    Version:
+        <div>    Version:
     <a href={releaseUrl} target="_blank" rel="noopener noreferrer">
       {version}
-    </a>
-  </div>
-        <div>© {new Date().getFullYear()} Computing:Box • Created with ♥ by Mr A Lyall</div>
+    </a> • © {new Date().getFullYear()} Computing:Box • Created with ♥ by Mr A Lyall</div>
       </div>
     </footer>
   </body>