Remove actualRoot references from application.js, use relative paths

[#69828562]
Remove actualRoot references from application.js, use relative paths

[#69828562]
Fix Guardfile (rm missing lab_fontface.rb script)
Update Gemfile.lock (after switching s3_website branch)
Fix beam images in "crookesElectrodes" interactive

[#57165590]
Fix disk piece images in "crookesElectrodes" interactive

[#57165590]
Fix gold disk image in "crookesElectrodes" interactive

[#57165590]
Use s3_website 1.7.5 which includes optimized diff calculation

[#69671476]
Merge branch 'master' into staging