Update development instructions in README

Include installation of AEgir, downloading/building package docs, and switch `hugo server` to `make serve` since, if we ever need it to do more, we probably want people calling Make instead of Hugo directly.

License: MIT
Signed-off-by: Rob Brackett <rob@robbrackett.com>

.gitignore

@@ -1,3 +1,4 @@
+node_modules/
 public/
 tmp/
 themes/material/original/

README.md

@@ -27,8 +27,27 @@ TODO
 
 ## Developing the site
 
-* [Install Hugo](https://gohugo.io/)
-* In the root directory, run `hugo server`
+### One-Time Setup
+
+1. [Install Hugo](https://gohugo.io/)
+2. Install [AEgir](https://www.npmjs.com/package/aegir)
+
+    ```sh
+    npm install -g aegir
+    ```
+
+3. Download IPFS libraries and tools (e.g. go-ipfs, js-ipfs) and generate their documentation:
+
+    ```sh
+    make packages
+    ```
+
+    (Repeat this step anytime a package with autogenerated documentation has a new release.)
+
+
+### Build and Run the Site
+
+* In the root directory, run `make serve`
 * Load http://localhost:1313 in your web browser
 * Edit and add things!