fix documentation generation

The output directory is missing the branch name.

.gitlab-ci.yml

@@ -141,7 +141,7 @@
   - apk add make
   - cd doc
   - pip3 install -r requirements hg-evolve
-  - for language in en fr ; do LANGUAGE=$language BUILDDIRSUFFIX=/$CI_COMMIT_HG_BRANCH make html ; done
+  - for language in en fr ; do make LANGUAGE=$language BUILDDIRSUFFIX=/$CI_COMMIT_HG_BRANCH html ; done
 
 publish_documentation:
   needs:

doc/Makefile

@@ -34,4 +34,4 @@
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile autotodo
-	@$(SPHINXBUILD) -b $@ "$(SOURCEDIR)" "$(BUILDDIR)/$@/$(LANGUAGE)$(BUILDDIRSUFFIX)" -d "$(BUILDDIR)$(BUILDDIRSUFFIX)/doctrees/$(LANGUAGE)" $(SPHINXOPTS) -D language=$(LANGUAGE) $(O)
+	@$(SPHINXBUILD) -b $@ "$(SOURCEDIR)" "$(BUILDDIR)/$@/$(LANGUAGE)$(BUILDDIRSUFFIX)" -d "$(BUILDDIR)/doctrees/$(LANGUAGE)$(BUILDDIRSUFFIX)" $(SPHINXOPTS) -D language=$(LANGUAGE) $(O)