don't require the host to be in the Image tag

now that we know our base host via config, we can stop hardcoding it in
each Image tag

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

incorporealcms/markdown.py

@@ -90,7 +90,7 @@ def handle_markdown_file_path(path: str) -> str:
     return template.render(title=page_title,
                            config=Config,
                            description=get_meta_str(md, 'description'),
-                           image=get_meta_str(md, 'image'),
+                           image=Config.BASE_HOST + get_meta_str(md, 'image'),
                            content=content,
                            base_url=Config.BASE_HOST + instance_resource_path_to_request_path(path),
                            navs=parent_navs,