Update fontawesome, jquery and datatables versions

[DomGarguilo]

This PR:

• bumps fontawesome from 4.0.3 -> 6.4.2
  • this required some changes to the class names of the icons
  • details on the fontawesome site outlining what has changed between these versions
  • the only visual change that took place was the link icon from https://fontawesome.com/v4/icon/link to https://fontawesome.com/icons/link?f=classic&s=solid
  • In the user manuals from 1.x versions, the html generated by asciidoc has a few places that font awesome is used and it looks like the old version but i am not sure where that code is generated or if we want to change that.
• bumps datatables from 1.10.12 to 1.13.6
  • the 1.10.12 import included a version of jquery with the download but I saw a note on the downloads page in the select packages section, that says "DataTables requires jQuery. Don't select either version if you already have it.". Because of this, the new link to datatables download does not include a version of jquery with it
• bumps jquery from 2.2.4 to 3.7.0

This partially addresses #394. Everything but the bootstrap update is handled here in this PR.

[ctubbsii]

• In the user manuals from 1.x versions, the html generated by asciidoc has a few places that font awesome is used and it looks like the old version but i am not sure where that code is generated or if we want to change that.

Those were generated by the Maven build in the older Accumulo releases, and should stay as they are. They don't need to be updated.