Add ecosystem guides (#3847)

* Add ecosystem guides

* Update titles

* Rename stric

* Add unlink and fetch guides

* Add formdata guide

* Tweak title

* Moar

docs/guides/install/npm-alias.md

@@ -0,0 +1,23 @@
+---
+name: Install a package under a different name
+---
+
+To install an npm package under an alias:
+
+```sh
+$ bun add my-custom-name@npm:zod
+```
+
+---
+
+The `zod` package can now be imported as `my-custom-name`.
+
+```ts
+import { z } from "my-custom-name";
+
+z.string();
+```
+
+---
+
+See [Docs > Package manager](/docs/cli/install) for complete documentation of Bun's package manager.