Add "sizes" array to each $product in $products array
Add <option> element for each available size for relevant product
create get_list_view_html($product_id, $product) function with moved code from shirts.php to products.php include file
Add function to index.php and shirts.php inside respective $products foreach loops
Restrict the latest shirts to only 4 of the latest shirts with the newest on the left
Add basic form validation to our contact form on contact.php
	- check if fields are blank
	- check for email header injections
	- check for spam bots via honey pot method