add websitecarbon badge

add badge on botom of the footer like this site

The badge : https://www.websitecarbon.com/badge/

Creat a similare issue on :

• Compagnons du DevOps site
• Lydra.fr
• Docusaurus bootstrap

added To Do label

assigned to @Plumtree3D

changed the description

created branch 130-add-websitecarbon-badge to address this issue

mentioned in merge request !107 (merged)

added Doing label and removed To Do label

added To Do label and removed Doing label

The badge does not appear on local hostings so I don't really know how to test it

added Doing label and removed To Do label

added Need Review label and removed Doing label

marked the checklist item Compagnons du DevOps site as completed

marked the checklist item Lydra.fr as completed

marked the checklist item Docusaurus bootstrap as completed

mentioned in commit 8965b044

closed with merge request !107 (merged)

removed Need Review label