Update and rename README.mdx to README.md

Author: jessiemongeon1

rust/send_http_post/README.mdx renamed to rust/send_http_post/README.md

@@ -2,11 +2,9 @@
 keywords: [intermediate, rust, http, post, http post]
 ---
 
-import { MarkdownChipRow } from "/src/components/Chip/MarkdownChipRow";
-
 # HTTP: POST
 
-<MarkdownChipRow labels={["Intermediate", "Rust"]} />
+[View this sample's code on GitHub](https://github.com/dfinity/examples/tree/master/rust/send_http_post)
 
 The purpose of this dapp is to give developers a minimal dapp that uses the IC's HTTPS outcalls feature to make a `POST` request.
 
@@ -15,7 +13,7 @@ This demo goes in hand with the [developer documentation on HTTPS outcalls](http
 If you want to start working on your project right away, you might want to try the following commands:
 
 ```bash
-cd send_http_post
+cd examples/rust/send_http_post
 dfx help
 dfx canister --help
 ```