Documentation re-organization

[annieappflowy]

Create a better structure to make the documentation more intuitive to navigate and easier to contribute
The documentation should include:

• User Manual: how to install, how to use, best practices, etc @Xazin
• Developer Docs: how to install from source, how to contribute, architect design, how to xxx, etc @LucasXu0
• Community Docs: programs, mentorship projects, community themes and plugins @richardshiue
• Organization Docs: values, roadmaps @annieappflowy

Steps:

• Create outlines (parent nodes and subpages under)
• Re-organize the current pages based on the new outlines
• Add missing resources
  - [ ] Team members should be responsible for writing product manuals for the features they built and to be built
• Send out a survey to the community for feedback and calculate the base rating for future iterations

High priority:

• Write a doc on how to self-host AppFlowy @speed2exe
• How to use TestFlight to test AppFlowy Cloud @LucasXu0

[Xazin]

For this step Add missing resources - We need to identify which are important to document, and which are low-priority or irrelevant.

This will become easier to identify once we have done the first, second, and fourth steps. Thus making this the final step.