Merge pull request #78 from is-a-dev/factory

feat: add factory.is-a.dev

Author: iostpa

src/index.md

@@ -40,6 +40,7 @@ These are the official subdomains run by the is-a.dev staff team.
 - [`all.is-a.dev`](https://all.is-a.dev) (visualization of [raw.is-a.dev](raw.is-a.dev), run by [@JustDeveloper1](https://github.com/JustDeveloper1).)
 - [`data.is-a.dev`](https://data.is-a.dev) (data visualization website, run by [@wdhdev](https://github.com/wdhdev).)
 - `docs.is-a.dev` (this website.)
+- [`factory.is-a.dev`](https://factory.is-a.dev) (Subdomain JSON file generator/factory.)
 - [`raw.is-a.dev`](https://raw.is-a.dev) (raw JSON API of all is-a.dev subdomains, run by [@wdhdev](https://github.com/wdhdev).)
 
 **Do *NOT* trust any websites claiming to be us that are not listed here. If you find any, please report them to [[email protected]](mailto:[email protected]).**