feat: Improved onboarding documents (#970)

* feat: New onboarding documents

* Images -> blocks

* Add tips

* test: removes assumptions of welcome documents

this actually results in the tests being much more understandable too

* add db flag when document was created from welcome flow

server/onboarding/philosophy.md

@@ -0,0 +1,19 @@
+# 👋 What is Outline
+
+Outline is a place to build your team knowledge base, you could think of it like your team’s shared library – a place for important documentation, notes, and ideas to live and be discovered. Some things you might want to keep in Outline:
+
+- Documentation
+- Sales playbooks
+- Support scripts
+- Onboarding
+- HR documents
+- Meeting notes
+- …and more
+
+## Structure
+
+Outline allows you to organize documents in "collections", for example these could represent topics like Sales, Product, or HR. Within collections documents can be interlinked and deeply nested to easily build relationships within your knowledgebase.
+
+## Search
+
+Outline is built to be crazy fast, and that includes [search](/search). You can start searching from anywhere with the `CMD+K` shortcut. Then filter by time, author, and more to get to the info you need.