docs: Restructure Studios getting-started tutorial [EDU-1408] - #1732

Changed pages include:

• index.html - view
• 404.html - view
• changelog/index.html - view
• fusion/index.html - view
• multiqc/index.html - view
• platform-cloud/index.html - view
• platform-enterprise/index.html - view
• search/index.html - view
• wave/index.html - view
• changelog/archive/index.html - view

There are more changes not included in the list