docs: Phase 0 - Clean up non-book documentation and fix API endpoints (#257)

* docs: Phase 0 - clean up non-book documentation

- Remove outdated standalone documentation files that are now in the book
- Delete duplicate cli-reference directories (docs/docs and docs/cli-reference)
- Add docs/book/ to .gitignore (mdBook build output)
- Fix typo in .gitignore comment

Part of #248

* fix(docs): correct incorrect /account endpoint references

- Change /account to / for Cloud API account info endpoint
- The /account endpoint returns 404; correct endpoint is /
- Fixed in all documentation files including quickstart, authentication, configuration, api reference, and cloud overview

Part of #248

Author: joshrotenberg

.gitignore

@@ -34,5 +34,8 @@ dump.rdb
 .claude/
 CLAUDE.md
 
-# Temporoary stuff
+# Temporary stuff
 tmp/
+
+# mdBook build output
+docs/book/