Improvements to connection settings

Dockerfile

README.md

frontend/.env

frontend/index.html

frontend/src/clientsettings/components/Connection.tsx

frontend/src/components/DocViewer/index.tsx

frontend/src/components/FileArea/index.tsx

frontend/src/components/FileViewRedirectButton/index.tsx

frontend/src/dashboard/ExerciseSelector/ImportDialog.tsx

frontend/src/dashboard/ExerciseSelector/index.tsx

...isepanel/ExerciseManager/components/ExerciseComponent.tsx

frontend/src/main.tsx

frontend/src/pages/(navbar)/settings.tsx

frontend/src/pages/instructor/+defUploader.tsx

frontend/src/ts.d.ts

frontend/substituteEnv.sh

graphql/.env

graphql/client/index.tsx

graphql/codegen.ts

graphql/connection/host.ts