Slider bubble improvements

[andyshinn]

This improves the slider bubbles from #1378. Closes #1570.

Changes:

• Ease in/out CSS transition is a bit more pleasing on the eyes.
• Added to all sliders except custom ones in color picker wheel.
• On desktop browser the bubble shows on hover instead of click.
• Minor formatting fixes (separate commit can be removed).
• Ignoring some venv Python folders to have PlatformIO installed in project easier (separate commit can be removed).

I tried showing the bubbles over the sliders (like Home Assistant) but ran into trouble with z-index. The bubbles get covered up by the top bar and other staytop classes. I couldn't figure that out so maybe for another time.

To fit these better I opened up the columns a bit more by just letting them auto grow. It seemed to looks OK on my desktop and mobile. The downside is there is a gap where the bubble shows since the slider is moved over. Let me know if we'd like to redesign this.

Mobile:

Desktop:

[jdtsmith]

This looks like a great update to me!

[blazoncek]

@Aircoookie bumping this.
It would be cool if you merged this one in.

[blazoncek]

This will make it into WLED as part of #2737 where it was merged more than a year ago.
I recommend to close this PR.

[andyshinn]

Cool. Are we finally merging the fork in and you will develop / tag on this repo? I was adding support for multiple repo building on WBLD but maybe I don't need to do that now ;)

[blazoncek]

I hope so. Everything made it in. It is just a matter of polishing things now.

[andyshinn]

Great, sounds good. Hope that happens soon!