Migrate project to KotlinJS

[gchristov]

What does this pull request change?

This PR:

• migrates the project to KotlinJS
• migrates the deployment to Google Cloud
• migrates CI to GitHub

How is this change tested?

Manually.

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Writing Kotlin Multiplatform tests

[pulumi]

🍹 The Update (preview) for gchristov/personal-website-proxy-web/prod was successful.

Resource Changes

    Name                      Type                            Operation
~   proxy-web-service-binary  docker:index/image:Image        update
~   proxy-web-service         gcp:cloudrunv2/service:Service  update

[pulumi]

🍹 The Update (preview) for gchristov/personal-website-landing-page-web/prod was successful.

Resource Changes

    Name                             Type                            Operation
~   landing-page-web-service-binary  docker:index/image:Image        update
~   landing-page-web-service         gcp:cloudrunv2/service:Service  update