Documentation update 2

Created by: Dhruva-Storz

A few fixes to website, a few additions

Created by: dilawar

In previous PR #225, following png files are missing. I think they are not added to git.

===========Latexmk: Missing input file: '{images/Gallery_Moose_Multiscale}.png' from line
  'LaTeX Warning: File `{images/Gallery_Moose_Multiscale}.png' not found on input '
===========Latexmk: Missing input file: '{images/Gallery_Moose_Multiscale}.png' from line
  'LaTeX Warning: File `{images/Gallery_Moose_Multiscale}.png' not found on input line 82.'
===========Latexmk: Missing input file: '{images/Gallery_Moose_Multiscale}.png' from line
  'LaTeX Warning: File `{images/Gallery_Moose_Multiscale}.png' not found on input '
===========Latexmk: Missing input file: '{images/Gallery_Moose_Multiscale}.png' from line
  'LaTeX Warning: File `{images/Gallery_Moose_Multiscale}.png' not found on input line 82.'
===========Latexmk: Missing input file: '{user/py/tutorials/../../../images/Help}.png' from line
  'LaTeX Warning: File `{user/py/tutorials/../../../images/Help}.png' not found on'
===========Latexmk: Missing input file: '{user/py/tutorials/../../../images/Help}.png' from line
  'LaTeX Warning: File `{user/py/tutorials/../../../images/Help}.png' not found on input line 28490.'
===========Latexmk: Missing input file: '{user/py/tutorials/../../../images/Help}.png' from line
  'LaTeX Warning: File `{user/py/tutorials/../../../images/Help}.png' not found on'
===========Latexmk: Missing input file: '{user/py/tutorials/../../../images/Help}.png' from line
  'LaTeX Warning: File `{user/py/tutorials/../../../images/Help}.png' not found on 

Created by: dilawar

Merging this PR to test on RTD.

Created by: dilawar

Review: Approved

Merged by: dilawar at 2018-01-22 03:53:12 UTC