docs: Add Marasi to showcase (#4455)

Added Marasi to showcase

Co-authored-by: Lea Anthony <lea.anthony@gmail.com>

website/docs/community/showcase/marasi.mdx

@@ -0,0 +1,22 @@
+# Marasi
+
+```mdx-code-block
+<p style={{ "text-align": "center" }}>
+  <img src={require("@site/static/img/showcase/marasi.webp").default} />
+  <br />
+</p>
+```
+
+[Marasi](https://marasi.app/) is an open source application security testing proxy, it lets you intercept, inspect, modify, and extend requests as they flow through your applications. Read more about it on the [blog](https://marasi.app/blog/2025/introducing_marasi/).
+
+## Features
+
+- Desktop GUI Interface: Cross-platform desktop application built with Wails
+- HTTP/HTTPS Proxy: TLS-capable proxy server with certificate management
+- Request/Response Interception: Modify traffic in real-time with an intuitive interface
+- Lua Extensions: Scriptable proxy behavior with built-in extensions
+- Project Management: SQLite-based storage for all proxy data (requests, responses, metadata)
+- Launchpad: Replay and modify HTTP requests
+- Scope Management: Filter traffic with inclusion/exclusion rules
+- Waypoints: Override hostnames for request routing
+- Chrome Integration: Auto-configure Chrome with proxy settings