updated image optimisation, updated readme accrodingly. fixed image issues, fixed navbar on mobile view + more

public/assets/mentors-images/convert-mentors-images.sh

@@ -1,11 +0,0 @@
-mkdir -p optimised
-for file in original/*; do
-    echo $file
-    base_name=$(basename $file)
-    if [[ $base_name == *"airiin"* ]] || [[ $base_name == *"lembitu"* ]] ; then
-        gravity=north
-    else
-        gravity=center
-    fi    
-    convert ${file} -resize "400x400^>" -gravity $gravity -extent 400x400  optimised/${base_name%}
-done