describe new model graph traversal work for developers
adjust for latest graph traversal changes
adjustments to new graph traversal for developers

suggested by @joshmoore, @hflynn, @pwalczysko, @bpindelski
re-wrap paragraph
add overview box

suggested by @hflynn
add note about order of rule matching
small changes suggested by @ximenesuk
remove the text about removing the omero.* logging filter

https://github.com/mtbc/openmicroscopy/commit/3dc00624
adopt @pwalczysko's "my" suggestion
rewrap paragraph
adjust wording re. inadvertent deletion

inspired by @pwalczysko
minor rewording re. thumbnails possessing pixels
Add new section about development tools
Modify scc title and introduction
Add stub page for omego
Link from ci-docs, improve ref to CI jobs, fixed typo
Add section about tools maintenance
addressing @will-moore comments
Define Pypi extlinks
Merge pull request #1052 from manics/jekyll

Add instructions for using Jekyll