UPDATE: Adds web app (#79)

Things missing:

* Browse mode
* Front end tests
* Storybook

webapp/src/icons/border-style.svg

@@ -0,0 +1,15 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<!-- <path d="M14 4H2" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M14 8H2" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-dasharray="2 2"/>
+<path d="M14 12H2" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-dasharray="0.01 2"/> -->
+<style>
+    line {
+      stroke: black;
+    }
+  </style>
+<line x1="0" y1="2" x2="16" y2="2" />
+  <!-- Dashes and gaps of the same size -->
+<line x1="0" y1="8" x2="16" y2="8" stroke-dasharray="2.28 2.28" />
+  <!-- Dashes and gaps of different sizes -->
+<line x1="0" y1="14" x2="16" y2="14" stroke-dasharray="1 2" />
+</svg>