Math containers are aligned center

[daroczig]

As we have the following in custom.css, each paragraph with an inline LaTeX formula gets centered:

.math-container {
    text-align: center;
}

I might be able to fix this, but you would not love that :)
Could you please tweak it a bit?

[daroczig]

Please verify @aL3xa

I had to tweak the container a bit: we have to align each paragraph to the left (and displaying inline), except for the ones with $$...$$. It seems to work based on my quick tests. If you could report back, I'd send the pkg to CRAN soon.