docs(README): simplify the main page

Author: Eoic

Makefile

@@ -1,9 +1,5 @@
 .PHONY: help install install-dev serve build clean lint
 
-help:
-	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | \
-		awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-15s\033[0m %s\n", $$1, $$2}'
-
 install: 
 	pip install -e .
 

docs/plans/2026-03-05-interactive-mermaid-diagrams-design.md

@@ -98,9 +98,6 @@ markdown_extensions:
 nav:
   - Home: README.md
 
-  - Analysis:
-      - Market analysis: market-analysis.md
-
   - Requirements:
       - Overview: requirements/README.md
       - Functional requirements: requirements/functional-requirements.md