bug: incorrect text length calculation

[0-vortex]

Describe the bug

The fonts we have used in the social cards are not monospaced, making the top repos go out of the view box depending on the text displayed, not the number of characters.

Steps to reproduce

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• Production

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[Deadreyo]

This was band-aided in #42 by decreasing the number of repos displayed from 4 to 3. A better solution would be counting the number of characters in the top 4 repos and dynamically checking if we can fit 4 repos in or if we will resort to 3 for each individual user.