feat: Added docs via MkDocs

docs/defaultEvents/onTick.md

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+# `event` onTick
+This event is triggered in every server main loop iteration.
+
+## Parameters
+No parameters.
+
+## Usage
+```python
+import g2o
+        
+@g2o.event('onTick')
+def onTickEvt(**kwargs):
+    print('Tock')
+```