Add README and make commands for mintlify stuff (#185)

Author: jklein24

Makefile

@@ -18,6 +18,9 @@ build-openapi:
 serve-docs:
 	cd docusaurus-docs && npm run start
 
+mint:
+	cd mintlify && mint dev
+
 lint:
 	npm run lint
 

README.md

@@ -835,6 +835,13 @@ cd docusaurus-docs && npm run start
 
 # Or use make
 make serve-docs
+
+# Serve Mintlify documentation:
+
+# First install mint if you haven't already
+npm i -g mint
+
+mint dev # or make mint
 ```
 
 ## OpenAPI