🐛 FIX: Update priority for LaTeX output for html and latex builders

[mmcky]

This PR increases the priority for text/latex representations for html and latex builders.

For html -- mathjax renders the text/latex representation more cleanly than typical images provided by some underlying packages (i.e. for png images) so promoted to be below image/svg+xml but above other image types.

For latex -- native latex syntax should be used in preference.

[mmcky]

• check if this PR fixes [jupyterbook-latex] [re_with_feedback] problematic math outputs generated by code QuantEcon/lecture-python.myst#95
• fix fixtures (the unknown mimtype fixture is removed as that test is current commented out in test_render_outputs.py)

[chrisjsewell]

I don't think latex should be above svg

[codecov]

Codecov Report

Merging #305 (37d949b) into master (2baade0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   87.35%   87.35%           
=======================================
  Files          12       12           
  Lines        1368     1368           
=======================================
  Hits         1195     1195           
  Misses        173      173           

Flag	Coverage Δ
pytests	87.35% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
myst_nb/render_outputs.py	86.79% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2baade0...37d949b. Read the comment docs.

[mmcky]

I don't think latex should be above svg

hey @chrisjsewell can you explain why? (i.e. page load times?) mathjax seems to do a nicer job of displaying the math. I am certainly open to demoting below svg but just want to understand why you think that is a better default priority.

For latex I think it certainly should be the highest output priority for native rendering.

[chrisjsewell]

Because svg is natively supported by HTML, latex is not

[mmcky]

Because svg is natively supported by HTML, latex is not

roger that.

[mmcky]

@chrisjsewell I see epub is listed as a builder in the builder option list.

Do you know if epub has a mechanism to support text/latex like mathjax for html?

Hmm -- I think epub uses mathml for math but also supports svg natively so another good reason to promote image/svg+xml. I guess the question is what happens if latex is passed before png.

Open to suggestions but perhaps we should:

• create a default priority for html based builders
• create a default priority for epub builder (separate like LaTeX)