Update public repo locations

README

 Here are some examples of the use of my Python binding
 ([GitLab](https://gitlab.com/ldo/python_pixman),
-[GitHub](https://github.com/ldo/python_pixman)) for the Pixman pixel-manipulation library.
+[BitBucket](https://bitbucket.org/ldo17/python_pixman)) for the Pixman pixel-manipulation library.
 You will need to have both that and Qahirah ([GitLab](https://gitlab.com/ldo/qahirah),
-[GitHub](https://github.com/ldo/qahirah)), my Python binding for Cairo graphics, installed
+[BitBucket](https://bitbucket.org/ldo17/qahirah)), my Python binding for Cairo graphics, installed
 before you can run these.
 
 Each example script generates its output to a PNG file with the same basename as the
@@ -14,4 +14,4 @@ Alternatively, you can see the generated output on my [DeviantArt
 account](https://default-cube.deviantart.com/gallery/54316106/Python-Pixman-Examples).
 
 Lawrence D'Oliveiro <ldo@geek-central.gen.nz>
-2019 April 14
+2023 September 6

operators

@@ -2,7 +2,7 @@
 #+
 # Demo of Pixman operators, reworking of Cairo version from
 # <https://gitlab.com/ldo/qahirah_examples/blob/master/operators>,
-# <https://github.com/ldo/qahirah_examples/blob/master/operators>.
+# <https://bitbucket.org/ldo17/qahirah_examples/src/master/operators>.
 # For an explanation of the difference between disjoint and conjoint
 # operators, see <http://marc.info/?l=xfree-render&m=99792000027857&w=2>,
 # and the Pixman source file pixman/pixman-combine32.c.