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/cypress/e2e/exploreToolPage.spec.js

@@ -0,0 +1,13 @@
+// / <reference types="Cypress" />
+
+describe('tests links on Explore Tool Page', () => {
+  it('validate file download', () => {
+    cy.visit('localhost:8000/en/cejst');
+
+    // Checks to make sure all a tags have an href:
+    cy.get('a').each(($a) => {
+      const message = $a.text();
+      expect($a, message).to.have.attr('href').not.contain('undefined');
+    });
+  });
+});