DOC Add Travis and Circle user scripts (scikit-learn#10409)

Author: lesteve

doc/developers/tips.rst

@@ -24,21 +24,22 @@ Viewing the rendered HTML documentation for a pull request
 ----------------------------------------------------------
 
 We use CircleCI to build the HTML documentation for every pull request. To
-access that documentation, instructions are provided in the
-:ref:`documentation section of the contributor guide
-<contribute_documentation>`. To save you a few clicks, we provide a
-`userscript <https://gist.github.com/lesteve/470170f288884ec052bcf4bc4ffe958a>`_
-that adds a button to every PR. After installing the userscript, navigate to any
-GitHub PR; a new button labeled "See CircleCI doc for this PR" should appear in
-the top-right area.
+access that documentation, instructions are provided in the :ref:`documentation
+section of the contributor guide <contribute_documentation>`. To save you a few
+clicks, we provide a `userscript
+<https://raw.githubusercontent.com/lesteve/userscripts/master/add-button-for-pr-circleci-doc.user.js>`_
+that adds a button to every PR. After installing the userscript, navigate to
+any GitHub PR; a new button labeled "See CircleCI doc for this PR" should
+appear in the top-right area.
 
 Folding and unfolding outdated diffs on pull requests
 -----------------------------------------------------
 
 GitHub hides discussions on PRs when the corresponding lines of code have been
 changed in the mean while. This `userscript
-<https://gist.github.com/lesteve/b4ef29bccd42b354a834>`_ provides a button to
-unfold all such hidden discussions at once, so you can catch up.
+<https://raw.githubusercontent.com/lesteve/userscripts/master/github-expand-all.user.js>`_
+provides a shortcut (Control-Alt-P at the time of writing but look at the code
+to be sure) to unfold all such hidden discussions at once, so you can catch up.
 
 Checking out pull requests as remote-tracking branches
 ------------------------------------------------------