refactor of docs

docs/events/mount.md

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+# Mount
+
+The `Mount` event is sent to a widget and Application when it is first mounted.
+
+- [ ] Bubbles
+
+## Parameters
+
+`sender`
+
+: The sender of the widget
+
+## Code
+
+::: textual.events.Mount

docs/events/resize.md

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+# Resize
+
+The `Resize` event is sent to a widget when its size changes and when it is first made visible.
+
+- [x] Bubbles
+
+## Parameters
+
+`event.size`
+
+: The new size of the Widget.
+
+`event.virtual_size`
+
+: The virtual size (scrollable area) of the Widget.
+
+`event.container_size`
+
+: The size of the widget's container.
+
+## Code
+
+::: textual.events.Resize