Add a link to free software definition in the homepage

website/i18n/en.yaml

@@ -29,7 +29,7 @@
   translation: Contact
 
 - id: intro
-  translation: Software Freedom Camp is an online mentorship programme focusing on diversity organized by <a href="https://fsci.in">Free Software Community of India</a> and inspired by <a href='https://camp.fsf.org.in'>Free Software Camp</a> and <a href='https://outreachy.org'>Outreachy</a>.
+  translation: Software Freedom Camp is an online mentorship programme focusing on diversity organized by <a href="https://fsci.in">Free Software Community of India</a> and inspired by <a href='https://camp.fsf.org.in'>Free Software Camp</a> and <a href='https://outreachy.org'>Outreachy</a>. Learn more about <a href="https://fsfe.org/freesoftware/index.en.html">Software Freedom</a>.
 
 - id: apply
   translation: Apply