1.4.0 release announcement blog (#1712)

* Create Announcing-Label-Studio-Version-140-Python-SDK.md

* Update Announcing-Label-Studio-Version-140-Python-SDK.md

* Add images and blog ref

* review feedback - add link to filters

* Update for date

* Update img to a code typing gif

* fix links and date

* [docs] update blog date

* update blog date

* update blog date

* Update date to monday