Docs tweaks (#2160)

* Tweaks

* Add ecosystem. Add bunx. Flesh out install.

* Tweaks

* Add TS to installation

* Tweaks

* New readme

* Write new readme

* Tweak

* Center header

* Bun

* tweaks

* No dollar sign

* Fix links

* Update

* Tweak

docs/ecosystem/express.md

@@ -0,0 +1,37 @@
+Projects that use Express and other major Node.js HTTP libraries should work out of the box. 
+
+{% callout %}
+If you run into bugs, [please file an issue](https://bun.sh/issues) *in Bun's repo*, not the library. It is Bun's responsibility to address Node.js compatibility issues.
+{% /callout %}
+
+```ts
+import express from "express";
+
+const app = express();
+const port = 8080;
+
+app.get("/", (req, res) => {
+  res.send("Hello World!");
+});
+
+app.listen(port, () => {
+  console.log(`Listening on port ${port}...`);
+});
+```
+
+Bun implements the [`node:http`](https://nodejs.org/api/http.html) and [`node:https`](https://nodejs.org/api/https.html) modules that these libraries rely on. These modules can also be used directly, though [`Bun.serve`](/docs/api/http) is recommended for most use cases.
+
+{% callout %}
+**Note** — Refer to the [Runtime > Node.js APIs](/docs/runtime/nodejs#node_http) page for more detailed compatibility information.
+{% /callout %}
+
+```ts
+import * as http from "node:http";
+
+http
+  .createServer(function (req, res) {
+    res.write("Hello World!");
+    res.end();
+  })
+  .listen(8080);
+```