Remove unnecessary strip_link

[dalance]

strip_link seems to remove all links from catalog.
According to the comment, it should be applied to summary only.

mdbook-i18n-helpers/i18n-helpers/src/xgettext.rs

Lines 145 to 149 in 71b4cc5

	// The summary is mostly links like "[Foo *Bar*](foo-bar.md)".
	// We strip away the link to get "Foo *Bar*". The formatting
	// is stripped away by mdbook when it sends the book to
	// mdbook-gettext -- we keep the formatting here in case the
	// same text is used for the page title.

Closes #202

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.51%. Comparing base (71b4cc5) to head (9440833).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
+ Coverage   89.50%   89.51%   +0.01%     
==========================================
  Files          13       13              
  Lines        3135     3138       +3     
  Branches     3135     3138       +3     
==========================================
+ Hits         2806     2809       +3     
  Misses        236      236              
  Partials       93       93              

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[dalance]

I added a link example to non-SUMMARY.md test to catch this case.