Updated Resources Page
Updated Resources Page

- Rewrote overview description
- Reformatted "Community" scetion for consistency with GitHub
- Removed IRC (redundant with Gitter)
- Added "Community Calls" section with links to prior sessions
- Added "Webinar" section with links to prior sessions
- Revised Bug Tracker copy
- Renamed "Tools for Provisioning & Experimentation" to "How to Install Nomad" section
- Bumped up the "How to Install Nomad" section right below to second on the list "Community"
- Removed "Videos" & "Blog Posts" section in favor of accurate segmentation between user talks, webinars, blog posts
- Added "Who Uses Nomad" section in consistency with new GitHub ReadME
- Removed the "Trusted By" section and disclaimer at bottom

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