Added all of the final functionalities

[gunjjoshi]

The following features were added:

• Admin, guest and user accesses : To set someone as admin, set the isAdmin field in the firestore DB to true in the users collection.
• Admin will be able to modify DB structure, by using the Modify DB Button.
• Users can only select values from the dropdowns in the input fields. They can only add the Resource Number, title will be auto generated by merging all other details. If the generated title already exists, user will be prompted to select some other combination of values.
• Users can upload all type of files.
• Make sure to add a proper .env file. Enable authentication and firestore DB in firebase. Also, in src/utils/awsConfig.ts, add your AWS credentials.