fix HTML relative paths to images

docs/user_guide/annotation_tool.md

@@ -61,12 +61,12 @@ A good way to manage different node versions is to use the [node version manager
 <!--
 NOTE: Raw HTML is used for this set of images as in the README to restrict screenshot size, but mkdocs doesn't play well with the relative path links (see https://github.com/mkdocs/mkdocs/issues/991), so the paths have been modified to start with `../` instead of `./` so mkdocs can find the right files.
 -->
-<img width="300" src="../imgs/annotate/readme_navbar.png" alt="Annotation tool navbar screenshot">
-<img width="300" src="../imgs/annotate/readme_nextpage_button.png" alt="Annotation tool next page button screenshot">
+<img width="300" src="../../imgs/annotate/readme_navbar.png" alt="Annotation tool navbar screenshot">
+<img width="300" src="../../imgs/annotate/readme_nextpage_button.png" alt="Annotation tool next page button screenshot">
 
 There are two means of moving forward to the next step in the annotation tool's workflow: (1) the <span style="color:green;">navbar</span> at the top right of the screen which features the page names, and (2) the <span style="color:green;">next page buttons</span> on the bottom right of each page.
 
-<img width="300" src="../imgs/annotate/readme_nextpage_instructions.png" alt="Annotation tool next page button screenshot">
+<img width="300" src="../../imgs/annotate/readme_nextpage_instructions.png" alt="Annotation tool next page button screenshot">
 
 However, special criteria for each page need to be be met in order to move forward. Instructions are offered above the <span style="color:green;">next page button</span> while those conditions are still as of yet unmet. (These are denoted below under _Next page criteria_.) After having done so, the next page's name in the <span style="color:green;">navbar</span> will turn from gray to green, and the <span style="color:green;">next page button</span> will turn from gray to green as well.