Improved Axes components + AxisTop and AxisRight

[mhkeller]

This includes better and more consistent behavior in axis components.

• [x] AxisX.svelte
• [x] AxisX.html.svelte
• [x] AxisY.svelte
• [x] AxisY.html.svelte

New components

• [x] AxisXTop.svelte
• [x] AxisXTop.html.svelte
• [x] AxisYRight.svelte
• [x] AxisYRight.html.svelte

Website elements

• [ ] Update examples
• [ ] Add a better controls GUI to the component gallery on the website