public static Path locateReference(Path sourceFile, String ref) throws URISyntaxException {

		URI resolved = resolve(sourceFile, ref);
		if (isRemote(resolved)) {
			return null;
		}

		// non-remote/local path
		Path refPath = createPathFromURI(sourceFile, resolved);
		return refPath;
	}
Turn an HTML HREF reference into an absolute path.  This will locate files based upon 
relative references, specialized help system references (i.e., help/topics/...),  and 
absolute URLs.

@param sourceFile the reference's source file
@param ref the reference text
@return an absolute path; null if the URI is remote
@throws URISyntaxException if there is an exception creating a URL/URI for the image location
Ghidra/Framework/Help/src/main/java/help/HelpBuildUtils.java