Improve theme README & exampleSite (#157)

* Improve theme README

* Update exampleSite

* Add "Available Translation" section in README

exampleSite/data/fr/sections/projects.yaml

@@ -23,7 +23,7 @@ buttons:
 # your projects
 projects:
 - name: Kubernetes
-  logo: images/projects/kubernetes.png
+  logo: /images/sections/projects/kubernetes.png
   role: Contributeur
   timeline: "Mars 2018 - Présent"
   repo: https://github.com/kubernetes/kubernetes # If your project is a public repo on GitHub, then provide this link. it will show star count.
@@ -32,7 +32,7 @@ projects:
   tags: ["professionnel", "kubernetes", "cloud"]
 
 - name: Tensorflow
-  logo: images/projects/tensorflow.png
+  logo: /images/sections/projects/tensorflow.png
   role: Développeur
   timeline: "Juin 2018 - Présent"
   repo: https://github.com/tensorflow/tensorflow
@@ -48,7 +48,7 @@ projects:
   tags: ["ecole","iot"]
 
 - name: Nocode
-  logo: images/projects/no-code.png
+  logo: /images/sections/projects/no-code.png
   role: Rien
   timeline: "Oct 2019 - Dec 2019"
   repo: https://github.com/kelseyhightower/nocode
@@ -57,7 +57,7 @@ projects:
   tags: ["hobby", "fun"]
 
 - name: Toha
-  logo: images/projects/toha.png
+  logo: /images/sections/projects/toha.png
   role: Owner
   timeline: "Juin 2019 - Présent"
   repo: https://github.com/hossainemruz/toha