browse/templates: Include icon in each entry link of directory view

Merged Antoine Lambert requested to merge anlambert/swh-web:directory-view-clickable-icons into master

It enables to enlarge the clickable area of each directory entry link and thus ease navigation when the entry name contains a few characters.

Related to #4756 (closed).

This is an alternative approach to !1169 (closed) which makes the whole File column clickable.

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