Add comical 404 topic plus grad-level 500 class. ;)

ebook.md

@@ -176,14 +176,20 @@ Forestry sometimes allows use of their dumpsters if you let them know you are pi
 
 - Stir it up to expedite composting.
 
-# 404: Battery Banks vs Power Stations
+# 403: Battery Banks vs Power Stations
 
 {TBD/TODO}
 
-# Graduation
+# 404: Topic Not Found
 
-Please feel free to share this information with others!
+Feel like we've missed something? Want to make a contribution? Feel free to reach out!
+
+[`me@hyperling.com`](mailto:me@hyperling.com)
+
+# 500: Share with Others!
+
+Please share this information with anyone it may help! It is freely available at the website below.
 
 [`hyperling.com/forest`](https://hyperling.com/forest)
 
-Enjoy your stay!
+We hope you enjoy your stay in the forests!