Bootstrap w/o Glyphicon Halflings (resolves #2485)

[brianshumate]

• Remove reference to Glyphicon Halflings @fontface
• Remove unused Glphyicon related classes

[brianshumate]

/static/bootstrap.min.js appears to be dynamically generated(?)

[slackpad]

@pearkes might be able to give a little guidance on how we update this

[brianshumate]

Sorry about all the noise — I had intended to retry this PR as I was not sure what else needed to be done after updating the bootstrap.min.css to see that no more requests to the fonts were occurring, but I figured out how it works so I'll restore/reopen and perhaps we can proceed.

It looks like doing a make ui builds the UI in a Docker container and also prepares an updated bindata_assetfs.go for the binary using go-bindata-assetfs. Then make dev indeed picks up the updated command/agent/bindata_assetfs.go and the subsequent running binary has no more 500 ISEs from a wget -r. 😸

I am unsure about the updated bindata_assetfs.go as it is in the repository, but should it be committed too?

[slackpad]

Yeah - that'll pick up your changes in the web assets that are built in for -ui. We didn't want to put the Ruby stuff in the normal build path so we check in the generated files. The release build makes sure that we have done this before we build a final release.

[slackpad]

Thanks! No more 404s.