Merge branch 'update-vuejs-post' into 'master'

add CTA to Vue.js blog post

Added a CTA to frontend update webcast [#613](https://gitlab.com/gitlab-com/marketing/issues/613) pending approval of watch page details.

See merge request !3923
Status Job ID Name Coverage
  Build
passed #6752395
docker
build

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passed #6752394
docker
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  Deploy
passed #6752396
deploy
deploy

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