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 :)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.90%. Comparing base (38054ab) to head (447ab48). Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1563   +/-   ##
=======================================
  Coverage   96.90%   96.90%           
=======================================
  Files         105      105           
  Lines        8629     8629           
=======================================
  Hits         8362     8362           
  Misses        267      267           

:umbrella: View full report in Codecov by Sentry.
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[mwestphal]

@stepperpig please resolve discussions that you adressed.

[mwestphal]

You still around @stepperpig ? This one is close to be merged :)

[stepperpig]

You still around @stepperpig ? This one is close to be merged :)

sounds good!

[mwestphal]

You still around @stepperpig ? This one is close to be merged :)

sounds good!

What I mean is that its still need a bit of work if you are up for it :)

[stepperpig]

You still around @stepperpig ? This one is close to be merged :)

sounds good!

What I mean is that its still need a bit of work if you are up for it :)

I'm up for it

[mwestphal]

Nice!

You still around @stepperpig ? This one is close to be merged :)

sounds good!

What I mean is that its still need a bit of work if you are up for it :)

I'm up for it

You need to rebase on the latest master and finish it up then :)

[stepperpig]

I've rebased and addressed all the changes. Unless there's anything else...? Let me know.

[mwestphal]

Thanks a lot @stepperpig !