DocSprint: VSO module restructuration.  Fixes #686
new powered logo, updates to cite.rst
added new powered logo
fix to cite doc
updated about
updated bugs
removed resources and reorgd main index
update to idl cheat sheet
fixes to vso
Merge pull request #1 from ehsteve/dps_helio_doc

Improvements to VSO documentation
Merge pull request #704 from dpshelio/doc_vso

DocSprint: VSO module restructuration
Merge pull request #705 from ehsteve/documentation_sprint

My doc sprint fixes