Add _Sidebar

_Sidebar.md

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+[[Home]]
+
+- [Variable Time](./pages/variabletime)
+  - Getting Started
+  - Layers
+  - Properties
+  - Animating
+  - Timeline
+  - Fonts
+  - Export
+  - Experiments
+  - Roadmap
+
+- The Secret Type Garden
+
+  - Controls
+  - Harvesting Specimen
+
+- Source Code
+
+  - variableTime
+  - The Secret Type Garden
+  - ofxVariableLab
+  - ofxGPUFont
+  - ofxMsdfgen
+  - dependencies
+