Add functional product discovery page (shows list of bonds)

[RusseII]

https://github.com/porter-finance/product/tree/main/spec/pages/product_discovery_page

• Fetch all porter bonds and display them in a list. Clicking on a porter bond should open the product page for that bond

[RusseII]

{
  bonds(first:5) {
    id
    name,
    symbol
  }
}

Add pagination?
Edit: Pagination is probably unnecessary for now unless you want to add it. We can just return the first 100 bonds or something. There will probably be 5 bonds made per month max so would take a while to get to 100...