bug#24981: [Website] All pages fail the HTML validation test

[sirgazil]

With the new website online, all pages pass the HTML validation, except 
for the Packages page, which has a </p> tag for no opened P element in 
every package description, and uses obsolete TT element in links to patches.

https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.gnu.org%2Fsoftware%2Fguix%2Fpackages%2F

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