Support linking to DockerHub from Integrations tab

[abelanger5]

Location

• [X] Browser
• [ ] CLI
• [ ] API

Motivation

Users should be able to connect a private Docker Hub registry from the browser. This behavior is currently only supported from the CLI.

Requirements

Implement the equivalent of porter connect dockerhub from the browser. Unfortunately, the way that Docker Hub lists repositories requires that you are only able to connect one image repo at a time. Requirements:

• [ ] Create a screen that allows input fields for the Dockerhub image path, Dockerhub username, and a personal access token. Use existing GCR/ECR modals as a template. See the docs for more info about Dockerhub fields.
• [ ] Update documentation to include instructions for how to link Dockerhub from the browser.

Additional Details

Raw markdown files for documentation will be uploaded to the /docs folder as soon as this issue is assigned.