You need URL rewriting. You need to go to your .htaccess file and write something like this.
RewriteEngine On
RewriteRule ^cv?$ cv.html [NC,L]
If your user types in www.mysite.com/cv
, it will show up contents of www.mysite.com/cv.html
Last parts are flags. NC (case insensitive)
.L(last - stop processing rules)
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solved How do I remove .html from my website pages? [duplicate]