Allow img tag in markdown

[slominskir]

Add image support to Corrective Action and Rationale markdown.

Linking to existing images inline simply needs to be switched on here:

https://github.com/JeffersonLab/jaws-admin-gui/blob/36939a5ba3a70ccf27f4b25f2069a30b8a7b559e/src/main/webapp/resources/js/jaws.js#L3

However, if we want to upload the image to the server it becomes more complicated.

Note: may also need to add style rules to size images.

Note: You CAN already include URL links in the markdown. So the workaround being used is to link to Opswiki or other locations that include images.