Update AddGarden Component

[capndave]

Please update the AddGarden component in the following way:

• Remove the submit button
• On a mobile view, the plus icons should appear to the right of the input element and act as the submit button (it shouldn't toggle the view)
• On a desktop view the submit button should be used. Please place it to the right of the input element.
• At the top of the html/jsx, there should be either a subcomponent or a declaration of the following:
  a. An arrow icon (see c, below) FaChevronDown icon and text saying "Add Garden". You can add the icon(s) using import { FaChevronDown } from "react-icons/fa
  b. On click, it should toggle formVisible.
  c. When formVisible is true, the component should display the FaChevronRight. If formVisible is false, show FaChevronDown.

Extra Credit

If you want to be extra awesome, feel free to add some tests for the component. You can do those in a separate pull request if you prefer.

[fernandoamz]

@capndave, May I take this one?

[capndave]

@fernandoamz Go for it! Thanks.

[fernandoamz]

@capndave Could you update the tags? It will change from October 3rd https://hacktoberfest.digitalocean.com/hacktoberfest-update

[paytonagreen]

I can work on this today!