Restore original paragraph spacing

[Eric-Arellano]

#103 removed a couple CSS rules that were being applied to blockquote, which was intentional.

But in the process, it resulted in p and some elements like ul li losing those rules too, and using the table rule from below. I suspect this was unintentional because there was a blank line between those elements and the table element:

article.pytorch-article dl dt,
article.pytorch-article dl dd

article.pytorch-article table {
   ..
}

This change resulted in paragraphs having a bottom margin of 2.5rem, when we want the theme's default of 1.125rem.

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This doesn't seem to impact spacing in <ol> and <ul>, but the code before this PR did cause too much space in <dl> (description list). Meanwhile, the code before #103 was bad that it was setting the style for <dt> (term), which resulted in the font not being bolded until #103. So, this PR fixes the spacing, but removes dt from the rule set so that it stays bold.

Before

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After

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[Eric-Arellano]

Thanks @coruscating for the report!

[coruscating]

Thanks for working on this @Eric-Arellano! Tested locally, and the paragraph spacings are good now with no change to <ul> and <ol> spacing as you described.