[skip ci] v2.18.0 release announcement (#4695)

website/release_announcement_drafts/v2.18.0.md

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+This release marks a number of improvements including
+
+- Ability to display multi-sample VCF in a 'matrix' or 'stacked' style view
+- Major improvements to the spreadsheet and SV inspector views, including:
+  - Let's you open tracks from in the spreadsheet and SV inspector
+  - Let's you re-navigate the breakpoint split view instead of launching a new
+    one each time
+  - Uses @mui/x-data-grid for display of the spreadsheet
+  - Makes separate columns for VCF INFO fields
+  - Ability to open much larger files
+- Auto-saves user sessions to a local IndexedDB, so you won't lose your sessions
+  anymore if your web browser closes (!!)
+  - Users can easily create "favorite" sessions to revisit for later, and admins
+    can create pre-configured sessions for their instancse for users
+- Improved 'aborting' behavior, still an ongoing process
+
+![image](https://github.com/user-attachments/assets/c1d2f66b-dfd6-446e-af3d-fd66b8750301)
+
+Screenshot of the multi-variant viewer