Bad links in the "Fireflowers" section

The link to "Rust is Software's Salvation" leads to a 404 page (although I'm not sure if this is a bug on their end or if it's been purposefully taken down), and the "Rust Marketing Pitch" links to the same blog post as the link above.

Apologies for not submitting a PR rather than an issue, but I'm not sure what the correct links are for them.

Start by locating the "Fireflowers" section in the repository and inspect the links for "Rust is Software's Salvation" and "Rust Marketing Pitch". Verify whether the first destination still exists and identify distinct, correct destinations for both links; done means the section contains working, appropriate links.

Written by the indexing model from the issue text.