Update app and ignore local artifacts

.gitignore

@@ -25,13 +25,16 @@ expo-env.d.ts
 npm-debug.*
 yarn-debug.*
 yarn-error.*
+debug_screenshots/
 
 # macOS
 .DS_Store
 *.pem
 
 # local env files
-.env*.local
+.env
+.env.*
+!.env.example
 
 # typescript
 *.tsbuildinfo
@@ -41,3 +44,6 @@ app-example
 # generated native folders
 /ios
 /android
+
+# Local College Kit API database
+backend/data/