refactor: update button label for dataset selection clarity

- Change button text from "Toggle filtered" to "Select/Deselect" for improved clarity in dataset selection functionality.

Author: RogersPyke

docs/index.html

@@ -80,7 +80,7 @@ <h1 class="header-title">RoboCOIN-DataManager</h1>
 
             <div class="top-selection-container">
                 <button class="btn-toolbar primary" id="toggleSelectionBtn" title="Toggle selection for displayed datasets">
-                    Toggle filtered
+                    Select/Deselect
                 </button>
             </div>