coorect 2019, 2022 and 2021 pages

Author: frederichecht

2019/index.html

@@ -16,7 +16,7 @@
 
   <div id="ffdaysMain">
     <div id="ffdaysTitle">
-      <img src="{{ site.url }}{{ site.baseurl }}/img/FreeFEM_days_11th_edition_blue.svg" alt="FreeFEM Days">
+      <img src="https://freefem.org/img//FreeFEM_days_11th_edition_blue.svg" alt="FreeFEM Days">
       <p>December 17, 18 & 19, 2019</p>
 	  <p> <a href="https://github.com/FreeFem/FreeFem-days/blob/master/README.md"> Previous  FreeFem days </a>
     </div>

2020/index.html

@@ -20,7 +20,7 @@
 
     <div id="ffdaysMain">
         <div id="ffdaysTitle">
-            <img src="https://freefem.org/img/img/FreeFEM_days_12th_edition_blue.svg" alt="FreeFEM Days">
+            <img src="https://freefem.org/img/FreeFEM_days_12th_edition_blue.svg" alt="FreeFEM Days">
             <p>December 10 & 11, 2020</p>
             <h2 style="color: red">This year the FreeFem days will be virtual.</h2>
             <p><a href="https://zoom.us"> Please install Zoom to see the lectures and participate in the FreeFEM days</a></p>

2021/index.html

@@ -17,7 +17,7 @@
 
   <div id="ffdaysMain">
     <div id="ffdaysTitle">
-      <img src="https://freefem.org/img//img/FreeFEM_days_13th_edition_blue.svg" alt="FreeFEM Days">
+      <img src="https://freefem.org/img/FreeFEM_days_13th_edition_blue.svg" alt="FreeFEM Days">
       <p>December 8, 9 & 10, 2021</p>
 	  <p> <a href="https://github.com/FreeFem/FreeFem-days/blob/master/README.md"> Previous  FreeFem days </a>
     </div>