docs: update to current state (#1556)

* fix: site folder

* fix: site folder

site/guides/000-zitadel-organizations.md

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+---
+title: ZITADEL organizations
+subtitle: Get to know ZITADEL
+img: logos/zitadel-logo-solo-darkdesign.svg
+date: 29 January 2021
+readingtime: 5min
+route: zitadel-organizations
+visible: true
+tags: beginner, developer
+---
+
+Learn how **ZITADEL** is structured around Organizations and how to create your organization and verify a domain to use with that new organization.

site/guides/100-zitadel-projects.md

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+---
+title: ZITADEL Projects
+subtitle: Get to know ZITADEL
+img: logos/zitadel-logo-solo-darkdesign.svg
+date: 12. March 2021
+readingtime: 10min
+route: zitadel-projects
+visible: true
+tags: beginner, administrator, product owner
+---
+
+Learn the basics about applications, roles and authorizations, and how projects allow you to group these together.

site/guides/200-oauth-recommended-flows.md

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+---
+title: OAuth recommended flows
+subtitle: OAuth
+img: tech/oauth.svg
+date: 12. March 2021
+readingtime: 15min
+route: oauth-recommended-flows
+visible: true
+tags: beginner, developer
+---
+
+Learn about the different authentication flows and which flow we recommend you should use for your application.

site/guides/300-guide-gtnz-service-users.md

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+---
+title: Service users
+subtitle: Create service user and authorize them for ZITADEL
+img: logos/zitadel-logo-solo-darkdesign.svg
+date: 08. April 2021
+readingtime: 10min
+route: guide-gtnz-service-users
+visible: true
+tags: beginner, developer, product manager
+---
+
+Learn the basics about ZITADEL Service Users, how to set them up and authorize with ZITADEL.