METRON-1780: Fix broken website images

[justinleet]

Contributor Comments

Noticed that a couple images have been broken through at least the 0.5.0 release, but didn't want to hold up the 0.6.0 release.

This makes the manual changes necessary to get it working again in generate-md.sh.

Please check out https://cwiki.apache.org/confluence/display/METRON/Website+PR+Merge for instructions on how to spin it up.

Just click through all the pages. No errors should occur on the command line related to a file not found.

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[mmiklavc]

+1, thanks @justinleet.

Verified this by clicking through all links on the main website as well as the site-book. It wasn't immediately clear to me from the PR description, but looking at the diff changes this appears to address issues specific to the site-book, in particular under the use-cases section.