Updating some of the references, deleting old ones

REFERENCES.md

@@ -6,11 +6,6 @@
 
 - [Docker Compose Reference](https://docs.docker.com/compose/compose-file/compose-file-v3/)
 
-### MongoDB/PyMongo
-
-- [MongoDB Shell Commands](https://docs.mongodb.com/manual/reference/)
-- [PyMongo Driver](https://pymongo.readthedocs.io/en/stable/)
-
 ## Source Code
 
 - [MongoDB Docker Image entrypoint shell script](https://github.com/docker-library/mongo/blob/master/5.0/docker-entrypoint.sh) (Context: Tried to replicate the command to create a new user in the original entrypoint script in the custom initialisation script in this app.)
@@ -23,15 +18,6 @@
 - [Tables](https://www.blog.pythonlibrary.org/2017/12/14/flask-101-adding-editing-and-displaying-data/)
 - [Tables, but interactive](https://blog.miguelgrinberg.com/post/beautiful-interactive-tables-for-your-flask-templates)
 
-## Stack Exchange/Overflow
-
-### MongoDB
-
-- [Creating MongoDB Database on Container Start](https://stackoverflow.com/questions/42912755/how-to-create-a-db-for-mongodb-container-on-start-up)
-- [Passing Environment Variables to Docker Container Entrypoint](https://stackoverflow.com/questions/64606674/how-can-i-pass-environment-variables-to-mongo-docker-entrypoint-initdb-d)
-- [Integrating Flask-Login with MongoDB](https://stackoverflow.com/questions/54992412/flask-login-usermixin-class-with-a-mongodb) (**This does not work with the app as is, and is possibly something that needs more research and development in the future**)
-- [Setting up a Postfix email notification system](https://medium.com/@vietgoeswest/a-simple-outbound-email-service-for-your-app-in-15-minutes-cc4da70a2af7)
-
 ## YouTube Tutorials
 
 ### General Flask Introduction
@@ -72,7 +58,7 @@ A much simpler and more rudimentary introduction to Flask and MongoDB.
 - [Build a User Login System with `flask-login`, `flask-wtforms`, `flask-bootstrap`, and `flask-sqlalchemy`](https://www.youtube.com/watch?v=8aTnmsDMldY)
 
 A much more robust method that uses the various Flask modules to make a more powerful framework.
-Uses SQL rather than MongoDB.
+Uses SQL.
 
 ### Flask techniques
 
@@ -80,4 +66,4 @@ Uses SQL rather than MongoDB.
 
 ### Flask handling file uploads
 
-- [Handlin File Uploads](https://blog.miguelgrinberg.com/post/handling-file-uploads-with-flask)
+- [Handling File Uploads](https://blog.miguelgrinberg.com/post/handling-file-uploads-with-flask)