style: Order column-count before column-gap

[kfranqueiro]

IMO it makes no sense to require column-count after other CSS columns properties; column count is the most pertinent bit of information (and sometimes is the rule that makes it evident that something is even using CSS columns to begin with) and putting it first should make other columns properties more readable.

[codecov-io]

Codecov Report

Merging #2395 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2395   +/-   ##
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  Coverage   98.88%   98.88%           
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  Files         100      100           
  Lines        4144     4144           
  Branches      535      535           
=======================================
  Hits         4098     4098           
  Misses         46       46

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[williamernest]

LGTM. It makes more sense to me to declare the number of columns before specifying gap/fill/span properties.