[DOC] Clarify role of components in docs

[notZaki]

Closes #634

[codecov]

Codecov Report

Merging #660 (8773228) into master (5369e1d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #660   +/-   ##
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  Coverage   93.56%   93.56%           
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  Files          26       26           
  Lines        1975     1975           
=======================================
  Hits         1848     1848           
  Misses        127      127           

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[jbteves]

LGTM; this will clarify things nicely for new users.
Thanks @notZaki !

[jbteves]

@all-contributors add @notZaki for documentation.

[allcontributors]

@jbteves

I've put up a pull request to add @notZaki! 🎉