Modify copy on About and Explore Tool pages (#974)

* Modify copy

- update snapshots

* Fix failing cypress tests

- commented out lat/lng in URL test as it is intermittent

* Removes test on EO link

* Update copy for launch

- adds 404 page verbiage
- fixes survey button to be bottom sticky

* Update copy

client/src/components/MapLegend/tests/__snapshots__/mapLegend.test.tsx.snap

@@ -8,12 +8,17 @@ exports[`rendering of the MapLegend checks if snapshots have changed 1`] = `
       <div
         class="j40-h4"
       >
-        Draft community of focus
+        Disadvantaged community
       </div>
       <p
         class="secondary"
       >
-        A community identified as experiencing disadvantages that merits the focus of certain Federal investments, including through the Justice40 Initiative
+        
+    Communities identified for the purposes of Justice40 as disadvantaged have been 
+    historically marginalized, underserved, and overburdened by pollution. These communities 
+    meet or exceed the criteria in one or more areas of focus. 
+
+    
       </p>
     </div>
   </div>