update README.md

Added links to dev and prod sites and moved note about the theme that this site is built with.

README.md

@@ -1,6 +1,6 @@
 # Who Built Bryn Mawr?
-
-- A bootstrap jekyll theme based on work by Aaron Frey
+Dev site: [https://digbmc.github.io/wbbm/](https://digbmc.github.io/wbbm/)
+Prod site: [https://wbbm.digitalprojects.brynmawr.edu/current/](https://wbbm.digitalprojects.brynmawr.edu/)
 
 ## To do:
 - [ ] Create nice display for images and metadata 
@@ -167,4 +167,6 @@ To add an item to a phase's nav bar, add an item its `navigation` list. Here is
 ```
 Be careful with your indentation, as it is significant in YAML. Use spaces instead of tabs to replicate the list structure pictured above.
 
-To remove an item from the menu, delete the corresponding `navigation` list item in menu.yml.
+To remove an item from the menu, delete the corresponding `navigation` list item in menu.yml.
+
+*This site was built using a bootstrap jekyll theme based on work by Aaron Frey.*