Update home

home.md

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 * [Controlling regional boundaries (Area Pane)](3-5-control-boundary)
 * [Undo & Redo (Actions Pane)](3-6-action-history)
 
-4 User Scenarios & Tips
+4 User Scenarios
 1. [Viewing horizontal temperature distribution](4-1-horizontal-scalar-field)
 2. [Viewing vertical temperature distribution](4-2-vertical-scalar-field)
 3. [Viewing horizontal wind flow](4-3-horizontal-vector-field)
 4. [Viewing vertical wind flow](4-4-vertical-vector-field)
 5. [Viewing 3D iso-level surface for jet stream](4-5-isosurface)
 6. [Viewing temporal changes of wind flow](4-6-time-series-data)
-7. [Saving as images & videos](4-7-saving-images)
-8. [Side-by-side comparison using two windows](4-8-multiple-windows)
-9. [How to speed up repeated tasks](4-9-speed-up-repetitions)
 
-5 Appendices
+5 Tips
+1. [Saving as images & videos](4-7-saving-images)
+2. [Side-by-side comparison using two windows](4-8-multiple-windows)
+3. [How to speed up repeated tasks](4-9-speed-up-repetitions)
+ 
+6 Appendices
 * [Acknowledgement](5-1-acknowledgement)