Build should copy *.ico, *.txt and .htaccess into dist as well

[kennethklee]

Noticed that running gulp build doesn't copy the the favicon.ico, robots.txt, and .htaccess into the dist directory.

[jcsrb]

We can add an "extras" task, that copies all files except the html once to the dist folder

like I did here https://github.com/jcsrb/jakob.cosoroaba.ro/commit/89932e013ba5b24d85a5de8a2beeccfb0855c935

if @sindresorhus thinks that is a good solution, I'll send in a PR

[sindresorhus]

@jcsrb sure

[jcsrb]

was fixed with 018bdbd
please close