docs(NODE-4018): Doc generation script improvements and site enhancements (mongodb#3157)

Author: baileympearson

.eslintignore

@@ -1,3 +1,4 @@
-docs
+/docs
 lib
 test/disabled
+!etc/docs

.gitignore

@@ -72,4 +72,5 @@ lb.env
 etc/docs/build
 !docs
 !docs/s/lib
-!docs/s/js
+!docs/s/js
+!docs/s/img/*png

docs/404.html

@@ -7,7 +7,7 @@
 <meta name="author" content="">
 <meta name="keyword" content="">
 
-    <link rel="shortcut icon" href="/node-mongodb-native/img/favicon.png">
+    <link rel="shortcut icon" href="/node-mongodb-native/s/img/favicon.ico">
 
     <title>404 Page not found</title>
 
@@ -52,8 +52,11 @@
       <div class="col-md-2"></div>
       <div class="col-md-6">
         <h1>404: Page not found</h1>
+        <a href="/node-mongodb-native">
+          <div> Return to Docs Homepage </div>
+        </a>
       </div>
-      <div class="col-md-2" id="mongodbJVMlogo"></div>
+      <div class="col-md-2" id="mongodbNodelogo"></div>
     </div>
     </div>
   </div>
@@ -65,7 +68,7 @@ <h1>404: Page not found</h1>
       <div class="col-md-12">
         <div class="footer">
   <div class="copyright">
-    <p>Copyright © 2015 <a class="smalltext" href="http://www.mongodb.com">MongoDB, Inc</a>.
+    <p>Copyright © 2022 <a class="smalltext" href="http://www.mongodb.com">MongoDB, Inc</a>.
       Licensed under <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/ ">Creative Commons</a>.
       MongoDB, Mongo, and the leaf logo are registered trademarks of MongoDB, Inc.
       </p>