chore: update docs

Author: hashemix

docs/_media/rust-mcp-filesystem-post.png

@@ -24,7 +24,7 @@
   <meta name="twitter:card" content="summary_large_image">
   <meta name="twitter:title" content="Rust MCP Filesystem: fast, asynchronous MCP server for seamless filesystem operations.">
   <meta name="twitter:description" content="Rust MCP Filesystem offers safe, cross-platform filesystem operations in Rust. Learn more about its features and usage.">
-  <meta name="twitter:image" content="https://rust-mcp-stack.github.io/rust-mcp-filesystem/_media/rust-mcp-filesystem.png">
+  <meta name="twitter:image" content="https://rust-mcp-stack.github.io/rust-mcp-filesystem/_media/rust-mcp-filesystem-post.png">
   <meta name="twitter:image:alt" content="Rust MCP Filesystem">
   <meta name="twitter:site" content="@rustmcp">