Add html-noplot recipe to doc/Makefile (#1468)

* DOC: Add html-noplot recipe to doc/Makefile

And we also tweak `make view` so that the built documentation opens regardless of whether it was built with make html or make html-noplot

* FIX: Pin sphinx-gallery

in MNE-BIDS doc/conf.py we have:

```
sphinx_gallery_conf["within_subsection_order"] = "mne_bids.utils._example_sorter"
```

But AFAICT this functionality wasn't workign prior to sphinx-gallery/sphinx-gallery#1391 , which was included in the release of sphinx-agallery v0.19 (released Feb 12 2025).

https://sphinx-gallery.github.io/stable/changes.html#v0-19-0

Given that v0.19 was released less than 1 year ago, I think it is reasonable to assume that devs/contributors might have a sphinx-gallery version < 0.19 installed locally, in which case building the mne-bids docuemntation will fail, but the reason/solution won't be explicit.

So I think that it is best to be explicit about the minimum required sphinx-gallery version we require to be able to successfully build our docs.

Author: scott-huberty

doc/Makefile

@@ -18,11 +18,22 @@ help:
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile
-	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(O)
+
+# Build without executing the example gallery (faster)
+html-noplot:
+	@$(SPHINXBUILD) $(SPHINXOPTS) -D plot_gallery=0 $(SOURCEDIR) $(BUILDDIR)
 
 # View the built documentation
+# If we build the example gallery, the index file is at _build/html/index.html
+# If we don't (e.g. html-noplot), then it is at _build/index.html
 view:
-	@python -c "import webbrowser; webbrowser.open_new_tab('file://$(PWD)/_build/html/index.html')"
+	@if [ -f "$(BUILDDIR)/html/index.html" ]; then \
+		python -c "import webbrowser; webbrowser.open_new_tab('file://$(PWD)/$(BUILDDIR)/html/index.html')"; \
+	elif [ -f "$(BUILDDIR)/index.html" ]; then \
+		python -c "import webbrowser; webbrowser.open_new_tab('file://$(PWD)/$(BUILDDIR)/index.html')"; \
+	else echo "No index.html file found to open. Did you build the docs?"; \
+	fi
 
 clean:
 	-rm -rf _build auto_examples generated

pyproject.toml

@@ -58,7 +58,7 @@ doc = [
   "seaborn",
   "sphinx-copybutton",
   "sphinx>=7.4.7",
-  "sphinx_gallery",
+  "sphinx_gallery>=0.19.0",
 ]
 # Dependencies for using all mne_bids features
 full = [