changed connection string to use user secrets

[jcocchi]

To Test:

• Remove your current connectionString user secret

  • In the /src/Jabbr-Core folder run dotnet user-secrets remove connectionString

• Set the new connection string

  • dotnet user-secrets set connectionString "Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=JabbREFTest;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False;MultipleActiveResultSets=True"

This will not effect your database in any way, you are simply adding the same connection string that was previously in your startup.cs class to instead be stored as a user secret on your machine. When this PR gets merged everyone will have to preform the above steps on their own machine.

[kevinleung23]

@jcocchi :shipit:

• [x] removed and updated user-secret connection string in PM
• [x] Basic Chat functionality + local Login + Social Auth
• Tested in Chrome and Edge