Updated the link in the footer to master

The _config.yml file has a gh_edit_branch variable that was pointing
to the unintended tesseract branch. This commit updated that variable
so that it now points to the master branch.

Resolves: issue #195
Signed-off-by: Anderson Caminha <[email protected]>

Author: and3rcg

_config.yml

@@ -63,7 +63,7 @@ footer_content: 'Copyright &copy CHAOSS; 2017-2021. <br>Distributed by an <a hre
 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/chaoss/grimoirelab-tutorial" # the github URL for your repo
-gh_edit_branch: "tesseract" # the branch that your docs is served from
+gh_edit_branch: "master" # the branch that your docs is served from
 # gh_edit_source: docs # the source that your files originate from
 gh_edit_view_mode: "tree" # "tree" or "edit" if you want the user to jump into the editor immediately