standardize binary names

basics/static-files/README.md

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+# static_index
+
+Demonstrates how to serve static files. Inside the `./static` folder you will find 2 subfolders:
+
+* `root`: A tree of files that will be served at the web root `/`. This includes the `css` and `js` folders, each
+  containing an example file.
+* `images`: A list of images that will be served at `/images` path, with file listing enabled.
+
+## Usage
+
+```bash
+$ cd basics/static_index
+$ cargo run
+```
+
+### Available Routes
+
+- [GET /](http://localhost:8080/)
+- [GET /images](http://localhost:8080/images)
+