Additions for v4.7.0 Release

[msymons]

With the release of v4.7.0 (containing lots of new goodies), Suggest...

• Add a logo-snyk.svg to dependencytrack.org/assets/images/integrations/
• Ditto for JIRA
• adding VDR to Platform Features
• Add something for dependency graphing?

[stevespringett]

Jira and snyk have already been added but commits need to be back ported to the 4.7 branch for them to show up in docs.