footer: fix broken edit link

Fixes: #91

Author: willcl-ark

_config.yml

@@ -55,9 +55,8 @@ keep_files:
 # Footer "Edit this page on GitHub" link text
 gh_edit_link: true # show or hide edit this page link
 gh_edit_link_text: "Edit this page on GitHub."
-gh_edit_repository: "https://github.com/bitcoin-dev-project/onboarding-to-bitcoin-core" # the github URL for your repo
-gh_edit_branch: "gh_pages" # the branch that your docs is served from
-gh_edit_source: "master" # the source that your files originate from
+gh_edit_repository: "https://github.com/chaincodelabs/onboarding-to-bitcoin-core" # the github URL for your repo
+gh_edit_branch: "master" # the branch that your docs is served from
 gh_edit_view_mode: "edit" # "tree" or "edit" if you want the user to jump into the editor immediately
 
 mermaid: