Removed trailing whitespace discovered by github linter.

While working on https://github.com/FreeCAD/FreeCAD/pull/9880,
I discovered a lot of linter issues.  These fixes all of them.

src/Mod/Start/StartPage/StartPage.html

@@ -11,7 +11,7 @@
         <div class="container">
             <div class="title">
                 <div class="version">
-                    VERSIONSTRING 
+                    VERSIONSTRING
                     <a title="T_VTOOLTIP" href="OpenSettings.py">
                         <img class="settingsicon" src="IMAGE_SRC_SETTINGS" alt="T_VTOOLTIP">
                     </a>
@@ -25,31 +25,31 @@
 FreeCAD blog">BLOG</a></li>
             </ul>
             <div id="tab1" class="panel">
-                
+
                 <div class="thumbnails">
 
                     SECTION_RECENTFILES
-    
+
                     <div class="footnote">
                         <b>T_TIP</b>: T_ADJUSTRECENT<br/>
                     </div>
-    
+
                     SECTION_EXAMPLES
-    
+
                     SECTION_CUSTOM
-    
+
                     <div id="customtip" class="footnote">
                         T_CUSTOM
                     </div>
-                
+
                 </div>
 
                 <div class="notes">
-                
+
                     <h2>T_NOTES</h2>
-                    
+
                     <textarea id="notepad"></textarea>
-                
+
                 </div>
 
             </div>
@@ -100,9 +100,9 @@ FreeCAD blog">BLOG</a></li>
                     <h2>T_COMMUNITYHELP</h2>
 
                     <p>T_DESCR_COMMUNITYHELP1</p>
-                    
+
                     <p>T_DESCR_COMMUNITYHELP2</p>
-                    
+
                     <p>T_DESCR_COMMUNITYHELP3</p>
 
                 </div>