Garlicky Shrimp with Broccoli and Toasted Breadcrumbs

cup(s) uncooked broccoli small florets

cup(s) water

olive oil extra-virgin, divided

cup(s) panko breadcrumbs

lemon zest

table salt divided

pound(s) uncooked shrimp large, peeled, deveined

clove(s), large garlic clove(s) sliced

cup(s) canned chicken broth

crushed red pepper flakes

fresh lemon juice