docs: fix typos and update section headings for clarity (#143)

## CHANGES

- Fix typo in CONTRIBUTING.md header
- Rename "Web Agent Setup" to clearer title
- Rename "IDE Agent Setup" to include usage
- Update anchor links to match new headings
- Improve documentation structure and navigation

docs/instruction.md

@@ -1,7 +1,7 @@
 # Instructions
 
-- [Web Agent Setup](#setting-up-web-mode-agents-in-gemini-gem-or-chatgpt-custom-gpt)
-- [IDE Agent Setup](#ide-agent-setup)
+- [Setting up Web Agent Orchestrator](#setting-up-web-agent-orchestrator)
+- [IDE Agent Setup and Usage](#ide-agent-setup-and-usage)
 - [Tasks Setup and Usage](#tasks)
 
 ## Setting up Web Agent Orchestrator