Add logo and clickable banner to toolbar

[johndpjr]

Context

Our banner in the top left corner of the screen doesn't do much - all it contains is the text "AgTern" - without any interaction. Let's change that.

TODO

• [x] Add the AgTern logo (attached in Figure 2) and a vertical white line to the top left banner (see Figure 1)
• [x] Make the rectangular section that contains the logo, white line, and AgTern text clickable
• [x] Route the user to the home page when the banner is clicked

Notes

Figure 1. Banner mock-up.

[johndpjr]

Banner added!