Documentation refresh with focus on contribution guidelines

doc/CREDITS.md

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+LibreNMS is a fork of the last GPL-licensed revision of Observium.
+  http://observium.org/
+  Copyright 2006-2012 Adam Armstrong <adama@memetic.org>.
+  GPLv3
+
+LibreNMS ships with the following software components:
+
+- Bootstrap Datetime picker
+  https://github.com/Eonasdan/bootstrap-datetimepicker
+  Copyright (c) 2014 Eonasdan, nikoskalogridis
+  MIT License
+
+- Moment
+  http://momentjs.com
+  MIT License
+
+
+Other components (needs details filled in):
+- JpGraph (html/includes/jpgraph): QPL 1.0 license
+- MIBS (mibs): unknown/various
+- html/graph-realtime.php: BSD (original?)
+- html/includes/collectd/: GPLv2 only
+- overLIB (html/js/overlib_mini.js): modified Artistic 1.0?
+- scripts/*/mysql: GPLv2 only
+- check_mk (scripts/observium_agent*): GPLv2
+- qTip (html/css/jquery.qtip.min.css and html/js/qtip/jquery.qtip.min.js): GPLv2
+