Sample file updates for v2.0.0 release

[etimberg]

The sample files need some updates in preparation for the v2.0.0 release.

General guidelines

• Style all pages the same way. No canvas visual styling (border, shadow, etc)
• Set user-select style so that canvas cannot be selected
• Style all canvases to be the same size on the page
• Set meaningful titles for each sample. Should also display chart title on canvas
• Ensure that samples that need to support interactivity have appropriate buttons
• Remove HTML legends
• Remove data logging

Bubble

• Cannot add a dataset after all datasets have been removed
• New datasets do not have proper labels
• Remove 'show' button

Doughnut

• Error when removing dataset after all datasets have been removed

Line

• Hidden dataset has no data

Line Custom Tooltip

• Remove data logging on hover
• Increase size of chart

Line Legend

• Fix x labels during 'add data' button

Line Logarithmic

• Fix x labels during 'add data' button

Line Skip Points

• Fix x labels during 'add data' button

Line stacked area

• Fix x labels during 'add data' button

Line x-axis filter

• Fix x labels during 'add data' button

Pie Sample

• Error when removing all datasets in pie
• Legend error when no datasets

Radar

• Hidden dataset has no data

Tooltip hooks

• Fix x labels during 'add data' button

Animation progress

• Fix x labels during 'add data' button

Line time point data

• Cannot add data after all data removed

[tannerlinsley]

I wonder if all of the samples should be converted to code pens. This way we can easily embed them in the docs.

[hamalaiv]

I could take a look at these if you don't mind.

[etimberg]

@hamalaiv that'd be great

[etimberg]

Done in #2069