Make Blade documentation self-hosted

[mcfriend99]

This task intends to replace the existing bladelang.com website with a new version that's completely built in Blade. Nyssa documentation and Getting Started link will also be effectively pointing to it as Nyssa documentation will now be hosted along with Blade.

[Visco33]

https://bladelang.com/ appears to be down, is this related?

[taivlam]

The website seems like it's been taken over and turned into a single page Polish language site that has a target audience for retirees, but then clicking on the only button leads to a free website building service called mobiri.se.

According to Wayback Machine captures, the last time the site properly displayed Blade documentation was on December 1, 2023.