Upgrade Docusaurus for Writings

[gkoscky]

The Writings blog runs on a very old version of Docusaurus: 2.0.0, while the current version is 2.4.3.

We're missing out on a number of features and bug fixes and should look into upgrading the platform.

[come-maiz]

Docusaurus is now v3.6. Even more important to upgrade now, since we are being left behind.