Add necessary changes to support connecting to Heroku postgres

[simhonchourasia]

Notion ticket link

Heroku Postgres: Look into Hosting a Postgres DB on Heroku & Backend

Implementation description

• Change migrations to work with sequelize from bash
• Use ssl for heroku connection to postgres db
• Use different config and env files

Steps to test

1. Use command heroku pg:psql postgresql-solid-50144 --app sleepy-caverns-02101 to connect to the database and check it out
2. Make a graphql request like the following:

query {
    dashboardById(id: 2) {
        reviewerEmail
    }
}

at https://sleepy-caverns-02101-edcc7706ba5e.herokuapp.com/graphql (link might be outdated).

What should reviewers focus on?

• Currently firebase authentication doesn't quite work for this, as seen in certain endpoints (such as most of the user queries)

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR