Enable "html" in quilt_summarize.json

[fiskus]

This is a quick fix. I've started to work on a more general solution, but this small piece, I think, self-sustainable.

More scalable solutions require more involvement, but I have several ideas already:

• enable everything we have Previews for
• make "name" optional, and treat it like fallback type
• improve JsonEditor, so users can create with config with some helper and make "name" a plain string but with select from supported types
• make custom editor for writing quilt_summarize.json
• or, change (make v2) Schema (but I'd go with custom editor first, so customers wouldn't care about Schema)

• Documentation
• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.60%. Comparing base (207546e) to head (8c33976).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4252   +/-   ##
=======================================
  Coverage   37.60%   37.60%           
=======================================
  Files         769      769           
  Lines       33993    33993           
  Branches     5361     5361           
=======================================
  Hits        12784    12784           
  Misses      20022    20022           
  Partials     1187     1187           

Flag	Coverage Δ
api-python	91.29% <ø> (ø)
catalog	15.64% <ø> (ø)
lambda	91.48% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.