Fix inconsistent text rendering

[bokub]

Font spacing in inconsistent when puppeteer is launched in headless mode (related issue).

For example, if you input the following text in wtfresume.com, the numbers are aligned as you can see in the screenshot.

aaaaa..................................................................|111
qwertyasdfzxcvyuiohjklbnm.............................|222
longlonglonglonglonglonglonglongshorty......|333

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However, this is what the rendered PDF looks like:

• The numbers aren't aligned anymore
• The spacing between letters is very inconsistent

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With --font-render-hinting=none, the issue is fixed, as you can see here:

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