Chore(docs): update README

Author: till

README.md

@@ -2,9 +2,39 @@
 
 A buildpack static websites, aka for:
 
-* hugo
-* md-book
+* gohugo
+* mdBook
+
+---
+
+Here's a high-level overview about how this works:
+
+```mermaid
+graph TD
+    subgraph BUILD ["build phase"]
+        direction LR
+        version-->dl["download tool"]
+    end
+
+    subgraph DETECT ["detect phase"]
+        direction LR
+        w["check work dir"]-->t["determine type"]
+    end
+
+    DETECT-->d(("gohugo or mdBook"))
+    d-->BUILD
+    BUILD-->s["container with nginx/apache + your site"]
+```
 
 Some configuration is available, please see [api](./api/) for details.
 
+## Dependencies
+
+- `paketo-buildpacks/nginx`
+- `paketo-buildpacks/httpd`
+
+Either of these can be customized through various environment variables or a full config file for the web server. More details are available [on our documentation](https://www.runway.horse/docs/recipes/webservers/).
+
+## Usage / License
+
 Feel free to use this, as you see fit. For the turn-key zero-config solution, please check out [our PaaS service Runway](https://www.runway.horse/).