Index / Copy blog post which ought to belong on SpiderMonkey website.

[nbp]

While answering on reddit, I noticed that 2 blog post, which are describing the internals of SpiderMonkey are not available on the list of blog posts, namely:

• https://jandemooij.nl/blog/wx-jit-code-enabled-in-firefox/
• https://hacks.mozilla.org/2020/11/warp-improved-js-performance-in-firefox-83/

On a similar topic, we should do the same for https://blog.mozilla.org/javascript/ and some personal blog of previous employee, such as https://h4writer.com/

[jandem]

The Warp post is mentioned under "In-depth Articles" on the https://spidermonkey.dev home page. I think it's fine to leave out the W^X post, that was more of a personal blog post that's no longer accurate (use of mprotect for interrupt checks, for example).

It would be nice to import https://blog.mozilla.org/javascript though :)