Change URL of ParaView Guide to new ReadTheDocs page

Added logic to open a local PDF file verison of the Guide instead if
it exists in the local documentation directory.
4 jobs for !4330 with 20130-docs-update
detached
Status Job ID Name Coverage
  Package
manual #5158136
linux docker paraview build manual
docs:generate
manual #5158135
linux docker paraview build manual
spack:centos7
 
  External
passed cdash-commit

failed ghostflow-branch-check-master