Small bug fixes

- Logo DOM sctrucutre now valid, no longer <a/> within </a>
 - `data-wd-key` not longer required
 - `maputnik-doc-popup` not longer hidden by LayerEditor accordion

src/styles/_react-collapse.scss

@@ -1,5 +1,8 @@
 // See <https://github.com/nkbt/react-collapse/commit/4f4fbce7c6c07b082dc62062338c9294c656f9df>
 .react-collapse-container {
-  position: relative;
-  overflow: hidden;
+  display: flex;
+
+  > * {
+    flex: 1;
+  }
 }

src/styles/_toolbar.scss

@@ -9,7 +9,13 @@
   background-color: $color-black;
 }
 
+.maputnik-toolbar-logo-container {
+  position: relative;
+}
+
 .maputnik-toolbar-logo {
+  text-decoration: none;
+  display: block;
   flex: 0 0 180px;
   width: 180px;
   text-align: left;
@@ -21,6 +27,7 @@
 
   h1 {
     display: inline;
+    line-height: 26px;
   }
 
   img {
@@ -51,9 +58,7 @@
 }
 
 .maputnik-toolbar-version {
-  position: absolute;
   font-size: 10px;
-  bottom: -2px;
   margin-left: 4px;
   white-space: nowrap;
 }