docs: fix image link in README.md (#2940)

fixes: #2915

Co-authored-by: Hailee Thomas <[email protected]>

Author: stvml

README.md

@@ -21,7 +21,7 @@ It is intended to be used as part of your continuous integration system to enabl
 
 What CVE Binary Tool does when it runs:
 
-![Diagram of cve-bin-tool's workflow, described in text with more detail below.](doc/images/cve-bin-tool-workflow-800px.png)
+![Diagram of cve-bin-tool's workflow, described in text with more detail below.](https://raw.githubusercontent.com/intel/cve-bin-tool/main/doc/images/cve-bin-tool-workflow-800px.png)
 
 1. Download CVE Data (from NVD, Redhat, OSV, Gitlab, and Curl).
     - This happens once per day by default, not every time a scan is run.