Update Grid links to Lightning AI (#14081)

* initial changes for lightning

* Update .github/BECOMING_A_CORE_CONTRIBUTOR.md

Co-authored-by: Adrian Wälchli <[email protected]>

Co-authored-by: Adrian Wälchli <[email protected]>
(cherry picked from commit 5801484)

Author: 2 people

.github/BECOMING_A_CORE_CONTRIBUTOR.md

@@ -62,4 +62,4 @@ We are on the lookout for new people to join, however, if you feel like you meet
 
 ## Employment
 
-You can also become a [Grid.ai](https://www.grid.ai) employee or intern and work on Lightning. To get started, you can email `careers@grid.ai` with your resume or check out our [open job postings](https://boards.greenhouse.io/gridai).
+You can also become a [Lightning AI](https://lightning.ai/) employee or intern and work on Lightning. To get started, you can email `careers@lightning.ai` with your resume or check out our [open job postings](https://boards.greenhouse.io/lightningai).

SECURITY.md

@@ -1,2 +1,2 @@
-developer@grid.ai
+developer@lightning.ai
 [email protected]

src/pytorch_lightning/README.md

@@ -14,8 +14,8 @@ ______________________________________________________________________
   <a href="https://pytorch-lightning.readthedocs.io/en/stable/">Docs</a> •
   <a href="#examples">Examples</a> •
   <a href="#community">Community</a> •
-  <a href="#grid-ai">Grid AI</a> •
-  <a href="#license">License</a>
+  <a href="https://lightning.ai/">Lightning AI</a> •
+  <a href="https://github.com/Lightning-AI/lightning/blob/master/LICENSE">License</a>
 </p>
 
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