Update readme for changes in update/test/release process

README.md

 # dir-index-html
 
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-> Directory listing HTML for go-ipfs gateways
+> Directory listing HTML for `go-ipfs` gateways
 
-This repo is not be used standalone. It's used by the gateway code in go-ipfs. It'll be merged into the gateway package, once the gateway has been extracted from go-ipfs.
+**NOTE:** This repo is not intended to be used as a standalone project! This code is used by the gateway code within [`go-ipfs`](https://github.com/ipfs/go-ipfs). In the long term, once the the gateway is extracted from `go-ipfs`, the code in this repo will be merged into that gateway package.
 
 ![](https://user-images.githubusercontent.com/157609/88379209-ce6f0600-cda2-11ea-9620-20b9237bb441.png)
 
 ## Updating
 
-1. Make changes to _both_ dir-index.html and dir-index-uncat.html.
-2. Follow the instructions in [go-ipfs](https://github.com/ipfs/go-ipfs/tree/master/assets#updating-dir-index-html) for updating the directory index.
+When making updates to the directory listing page template, please note the following:
+
+1. Make your changes to the (human-friendly) source documents in the `src` directory
+2. Before testing or releasing, make sure to run the build script to generate a minified version in the `dist` directory:
+
+```bash
+> npm run build
+```
+3. To get your updates into `go-ipfs`, you'll need to do the following:
+     - Cut a new, appropriately versioned release of `dir-index-html` (don't forget to bump the version number in `package.json`)
+     - Make a PR against `go-ipfs` following [these instructions](https://github.com/ipfs/go-ipfs/tree/master/assets#updating-dir-index-html) for updating the directory index
 
 ## Testing
 
-1. Install [go](https://golang.org/dl/).
-2. Run the test server:
+1. Make sure you have [Go](https://golang.org/dl/) installed
+2. Start the test server, which lives in its own directory:
 
 ```bash
 > cd test
 > go run .
 ```
+This will listen on [`localhost:3000`](http://localhost:3000/) and reload the template every time you refresh the page.
 
-This will listen on `localhost:3000` and re-load the template every time you refresh the page.
+If you get a "no such file or directory" error upon trying `go run .`, make sure you ran `npm run build` to generate the minified artifact that the test is looking for.
 
 ## Contribute
 
-Feel free to join in. All welcome. A good place to start is [the issues](https://github.com/ipfs/dir-index-html/issues).
+Feel free to join in. All are welcome! A good place to start is to check the [issues](https://github.com/ipfs/dir-index-html/issues) for anything you find interesting.
 
 This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).