disable color-scheme on remark iframe

[akellbl4]

In order to prevent problems like so #1421 we need to disable color-scheme for the iframe.
We can remove this line when support for color-scheme is implemented inside widget.

Issue for full support: #1430

[codecov]

Codecov Report

Merging #1429 (245ff26) into master (3d1a3fd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1429   +/-   ##
=======================================
  Coverage   58.12%   58.12%           
=======================================
  Files         131      131           
  Lines        2909     2909           
  Branches      743      743           
=======================================
  Hits         1691     1691           
  Misses       1087     1087           
  Partials      131      131           

Impacted Files	Coverage Δ
frontend/apps/remark42/app/utils/create-iframe.ts	0.00% <ø> (ø)

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[github-actions]

size-limit report 📦

Path	Size
public/embed.mjs	2.03 KB (+0.44% 🔺)
public/remark.mjs	72.37 KB (0%)
public/remark.css	8.2 KB (0%)
public/last-comments.mjs	35.51 KB (0%)
public/last-comments.css	3.79 KB (0%)
public/deleteme.mjs	12.05 KB (0%)
public/counter.mjs	749 B (0%)