Improve quickstart guide

[stepperpig]

Fixes issue #1259

Changes:

• Renamed page title from "Usage" to "Quickstart Guide".
• Added short introduction.
• Added "Prerequisites" section.
• Added "Run F3D" section and added quickstart section from README file.
• Reformatted supported file formats into table including scene and animation support.
• Improved style in "Animations" and "Plugins" sections.
• Added "Further Reading" section with links to other user documentation pages.

Potential Suggestions:

• Rename the "Usage" page to "Quickstart"? Maybe duplicitous as we have this already in the README file?

[mwestphal]

Thanks for your contribution @stepperpig ! Ill review thourougly when I can :)

[mwestphal]

Nice work, a few changes needed and some precision asked.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.82%. Comparing base (f002d29) to head (2e8a071).
Report is 11 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1563   +/-   ##
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  Coverage   96.82%   96.82%           
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  Files         108      108           
  Lines        7643     7643           
=======================================
  Hits         7400     7400           
  Misses        243      243           

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[mwestphal]

some changes required but good progress so far!

[mwestphal]

Im not sure I prefer this version tbh. The info is the same, just hard to get.

How about keeping just the first command in ``` ?

[stepperpig]

do you think we should keep the second command then?

also do you think we should expand the section slightly with 1-2 basic key bindings? or leave it more concise?

[mwestphal]

I think we should keep a single command here.

Since we now have a quick start guide, lets keep this section super short, so id say no bindings here.

[mwestphal]

@stepperpig please resolve discussions that you adressed.