Remove Stanford mHealth Platform link from README (#97)

# Remove Stanford mHealth Platform link from README

## ♻️ Current situation & Problem
Link is down, which triggers wrong markdown links actions. 


### Code of Conduct & Contributing Guidelines 

By submitting creating this pull request, you agree to follow our [Code
of
Conduct](https://github.com/StanfordBDHG/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordBDHG/.github/blob/main/CONTRIBUTING.md):
- [x] I agree to follow the [Code of
Conduct](https://github.com/StanfordBDHG/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordBDHG/.github/blob/main/CONTRIBUTING.md).

README.md

@@ -68,7 +68,7 @@ Every version of the application on the `main` branch is automatically packaged
 
 ## Deployment
 
-This repository contains all necessary files to deploy the web frontend to Google Cloud Firebase ([Stanford mHealth Platform](https://med.stanford.edu/mhealth.html)).
+This repository contains all necessary files to deploy the web frontend to Google Cloud Firebase.
 
 ### Deployment Configuration