Website: add page for Mesa upgrade

Author: dannywillems

website/docs/developers/mesa-upgrade.md

@@ -0,0 +1,61 @@
+---
+sidebar_position: 3
+---
+
+# Mesa upgrade
+
+The Mesa upgrade is a hardfork of the Mina Protocol that introduces several
+enhancements to zkApp capabilities. This page tracks the implementation of these
+features in the Rust node.
+
+## Overview
+
+The Mesa upgrade consists of three main protocol improvements:
+
+### Account update limit increases
+
+Increases the number of account updates allowed per transaction from 10
+signature-based and 5 proof-based updates to roughly triple those limits. This
+enables more complex zkApp logic to be executed in fewer transactions.
+
+- **Blog post**:
+  [Road to Mesa: Performance Dialed Up for zkApps](https://www.o1labs.org/blog/account-update-limit)
+- **Implementation status**: To be tracked
+
+### Events and actions capacity expansion (MIP-8)
+
+Increases the field element limit from 100 to 1024 for both events and actions
+per transaction, and removes the per-event/per-action mini-cap of 16 field
+elements. This allows zkApps to carry more information and instructions in a
+single transaction.
+
+- **Blog post**:
+  [Road to Mesa: Preparing for the Next Chapter with More Use Cases](https://www.o1labs.org/blog/mip-8-events-actions)
+- **Implementation tracking**:
+  [#1261](https://github.com/o1-labs/mina-rust/issues/1261)
+
+### zkApp state expansion
+
+Expands zkApp account state from 8 to 32 fields, allowing developers to store
+more data directly on-chain and reducing the need for external storage
+workarounds.
+
+- **Blog post**:
+  [Road to Mesa: Expanding zkApp State with Fewer Constraints](https://www.o1labs.org/blog/increasing-zkapp-state)
+- **Implementation status**: To be tracked
+
+## Implementation tracking
+
+All Mesa upgrade work is tracked in
+[#1259](https://github.com/o1-labs/mina-rust/issues/1259). Each feature has its
+own sub-issue that includes:
+
+- Links to relevant MIPs (Mina Improvement Proposals)
+- OCaml node patches implementing the feature
+- Rust node implementation PRs
+- Performance benchmarks and tests
+
+## Additional resources
+
+- [Mesa Hard Fork Project Board](https://www.notion.so/o1labs/Hard-Fork-MIPs-Project-1c9e79b1f910805fb44cdc2b9db2ee8e?p=1c9e79b1f910804da24ed4f96638ab2b&pm=s)
+- [Mina Protocol Website](https://minaprotocol.com/)

website/sidebars.ts

@@ -73,6 +73,7 @@ const sidebars: SidebarsConfig = {
       items: [
         'developers/getting-started',
         'developers/updating-ocaml-node',
+        'developers/mesa-upgrade',
       ],
     },
     {