refactor: restructure documentation (#420)

...hi/docusaurus-plugin-content-docs/current/introduction.md

...hr/docusaurus-plugin-content-docs/current/introduction.md

...hu/docusaurus-plugin-content-docs/current/introduction.md

...in/docusaurus-plugin-content-docs/current/introduction.md

...it/docusaurus-plugin-content-docs/current/introduction.md

...ja/docusaurus-plugin-content-docs/current/introduction.md

...ko/docusaurus-plugin-content-docs/current/introduction.md

...lt/docusaurus-plugin-content-docs/current/introduction.md

...lv/docusaurus-plugin-content-docs/current/introduction.md

...nl/docusaurus-plugin-content-docs/current/introduction.md

...no/docusaurus-plugin-content-docs/current/introduction.md

...pl/docusaurus-plugin-content-docs/current/introduction.md

...pt/docusaurus-plugin-content-docs/current/introduction.md

...ro/docusaurus-plugin-content-docs/current/introduction.md

...ru/docusaurus-plugin-content-docs/current/introduction.md

...se/docusaurus-plugin-content-docs/current/introduction.md

...sk/docusaurus-plugin-content-docs/current/introduction.md

...sl/docusaurus-plugin-content-docs/current/introduction.md

...sv/docusaurus-plugin-content-docs/current/introduction.md

...th/docusaurus-plugin-content-docs/current/introduction.md