fix img path in preprocessor

preprocMd.sh

 #!/bin/bash
 
     # generate namelist of collaborators from topic file
-    original="./topics/topic-template.md"
-    filename="topic-template.md"
-    build_dir="./build"
+    original='./topics/topic-template.md'
+    filename='topic-template.md'
+    build_dir='./build'
     baseurl='https://www.mat.tuhh.de'
 
     #make output copy
@@ -13,6 +13,7 @@
 
     #extract title of topic
     title="## `head -n 1 $build_dir/$filename | sed -e "s;#\s*;\[;g" -e "s;\(.*\);\1\](${filename%.md}.html);g"`"
+
     # prepare index
     # append research topic to index
     echo "Creating index.md ..."
@@ -31,7 +32,6 @@
         #sed -i "s;### Working Groups:\(.*\)$wg\(.*\);### Working Groups:\1\[$fullname\]($baseurl/forschung/$wg)\2;g" $build_dir/$filename  #uncomment this line for linking the mat.tuhh.de webpage
     done
 
-
     echo "Replacing collaborator keys..."
     namelist=`grep -h -i -m 1 -r "###\s*Collaborators (MAT):" $build_dir/$filename | sed -e 's/^###\s*Collaborators (MAT):\s*//I' -e 's/\s*,\s*/\n/g'  | sort -u`
     echo "Found the following keys: " $namelist
@@ -59,4 +59,5 @@
 
     done
 
-
+# adpat img path (prefix a dot)
+sed -i "s;\](/img/;\](./img/;g" $build_dir/$filename 
\ No newline at end of file