Get involved homepage section

[krsawyer100]

Create the get involved section of homepage

Acceptance Criteria (AC):

• [x] Background is set to the color white
• [x] Has an h3 tag that says "get involved" that is centered horizontally on the page, color is set to text, and is size 36pt, weight 600
• [x] three columns labeled adopt, foster, volunteer
• [x] Each column has an animal image
• [x] Each column has a h4 tag that either says "adopt", "foster", or "volunteer" that is the color secondary, size 24pt, and weight 500
• [x] Each column needs a p tag with a blurb about each section, with color text, size 14pt, and weight 400
• [x] Each column needs a link that leads the user to a website with more details about each topic, color primary, weight 500, size 18pt
• [x] Use BEM naming conventions
• [x] Submit a pull request