Port <ResourceModal> (part of <ListResources>) to App Router [#1066]

* move styling from styled components to CSS module
* refactor <ResourceModal> to `useContext` and `useCallback` to build
  `dismissModal()` function, rather than passing it in — this was
  necessary because all props of React Client Components need to be
  serializable (i.e., not functions), and <ResourceModal> needs to
  "use client" because it depends on `useState` and `useEffect`
* refactor the `_draw` function out into a distinct
  file (`modal_draw.js`) to reflect the lack of typing in that code (I
  briefly explored converting that file to Typescript and concluded
  the juice was not worth the squeeze)
  * note that this also means we don't need to add @types/d3 to
    devDependencies

static-site/components/list-resources/modal.module.css

@@ -0,0 +1,28 @@
+.background {
+  left: 0;
+  min-height: 100%;
+  min-width: 100%;
+  overflow: hidden;
+  position: fixed;
+  top: 0;
+}
+
+.modalContainer {
+  background-color: #fff;
+  border: 2px solid black;
+  font-size: 18px;
+  left: 10%;
+  max-width: 80%;
+  min-height: 80%;
+  min-width: 80%;
+  padding: 20px;
+  position: fixed;
+  top: 10%;
+  z-index: 100;
+}
+
+.title {
+  font-size: 20px;
+  font-weight: 500;
+  padding-bottom: 15px;
+}