Merge pull request #4620 from jim-parry/favicon

[ci skip] Add missing favicon to user guide source
diff --git a/user_guide_src/source/_themes/sphinx_rtd_theme/static/images/ci-icon.ico b/user_guide_src/source/_themes/sphinx_rtd_theme/static/images/ci-icon.ico
new file mode 100644
index 0000000..c4246f8
--- /dev/null
+++ b/user_guide_src/source/_themes/sphinx_rtd_theme/static/images/ci-icon.ico
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