[Demo] Update features example dashboard with selectors

[huong-li-nguyen]

Description

• Adds a page with all selectors in the control panel on the left (as Filter only) to the features demo dashboard
• Consolidates all docstrings inside selectors
• Fix CSS for table pagination

Screenshot

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[petar-qb]

Awesome as usual! 🧹 🚀

[nadijagraca]

Looks good. 🚀

[antonymilne]

Looks good! I think we should improve the Slider example if easy to do so, but no worries if not.

[maxschulz-COL]

Lgtm! If I could choose, I would probably work more with a graph, and ideally actually only one component, but that may be tough with fitting all the options in.

[huong-li-nguyen]

Lgtm! If I could choose, I would probably work more with a graph, and ideally actually only one component, but that may be tough with fitting all the options in.

Yeah, that's what I had before, but it did not work well if we want to have all selectors on one page 😄 They are contradicting each other / intersecting - which made the interactions horrible with one graph.