Modifies ExploreTool page to match sprint 4 design (#481)

* initial commit of sprint 4 explore page

* adds styling on HowYouCanHelp module

* troubleshooting li element on deployed URL

removing local bullet styles

* removing unused styles

* recreating HowYouCanHelp

* explicit list el styles

* adds bullets back in

* fixes tooltip style and alert padding

* componentize MapLegend

* fix links

* inital intl and unit tests

* adds trusswork tooltip for comparison

* updates based on various feedback and disucssions:

- removes react-tooltip
- placeholder trussworks tooltip
- removes download packet component
- intl on HowYouCanHelp
- updates MapLegend tests
- add initial cy test on ExploreTool page

* removes bold on alert

* PR feedback:

- removes location from J40Alert
- localizes `COLOR KEY`

* adds intl to constants file

* modifies download zip URL to new S3 location

* removes location depedencies on Alerts

* add localization for HowYouCanHelp

client/src/components/HowYouCanHelp/tests/__snapshots__/howYouCanHelp.test.tsx.snap

@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`rendering of the HowYouCanHelp checks if various text fields are visible 1`] = `
+<DocumentFragment>
+  <div>
+    <h2>
+      How You Can Help Improve the Tool
+    </h2>
+    <ul>
+      <li>
+        <div>
+          If you have helpful information, we’d love to 
+          <a
+            href="mailto:screeningtool.feedback@usds.gov"
+          >
+            get an email from you
+          </a>
+           .
+        </div>
+      </li>
+      <li>
+        <div>
+          View our 
+          <a
+            href="/en/methodology"
+          >
+            Data & methodology
+          </a>
+           and send us feedback.
+        </div>
+      </li>
+      <li>
+        <div>
+          Find your community and 
+          <a
+            href="mailto:screeningtool.feedback@usds.gov"
+          >
+            share your feedback
+          </a>
+           .
+        </div>
+      </li>
+    </ul>
+  </div>
+</DocumentFragment>
+`;