Blog post for JuMP 1.0 release (#71)

* WIP: begin post for JuMP 1.0

* Update

* Typo fix

* Minor tweaks

* Updates

* Update contributor list and fix typos

* Update and rename 2022-03-22-jump-1.0.md to 2022-03-24-jump-1.0.md

* Update _posts/2022-03-24-jump-1.0.md

Co-authored-by: Benoît Legat <[email protected]>

Co-authored-by: Benoît Legat <[email protected]>

Author: odow