Change the title in the website

[aliok]

Spin-off from https://github.com/knative/docs/issues/5407

Current title of Knative in the website is:

"Knative is an Open-Source Enterprise-level solution to build Serverless and Event Driven Applications"

Based on the the discussion in the related issue, https://github.com/knative/docs/issues/5407#issuecomment-1638505387,

I suggest we change it to

"Knative is an Open-Source Enterprise-level solution to build, deploy, and scale event-driven applications."

cc @knative/steering-committee