fix: improve Obsidian .gitignore to prevent personal config conflicts

[mehdipiraee]

Summary

• Ignore all personal Obsidian settings (app.json, appearance.json, workspace files)
• Keep only plugin-related configs (core-plugins.json, community-plugins.json)
• Remove personal config files from version control to prevent merge conflicts

Problem

The current .obsidian/ configuration tracks personal settings like themes and app preferences, which causes merge conflicts when different team members have different preferences.

Solution

• Changed .gitignore to ignore all .obsidian/* files except plugin configs
• Removed app.json and appearance.json from version control
• Kept core-plugins.json for shared team plugin standards
• Future community-plugins.json will be tracked for team plugin coordination

Benefits

• Team members can customize Obsidian themes/settings without conflicts
• Shared plugin configurations remain consistent across the team
• Follows standard practices for tool-specific configurations
• Reduces friction for contributors using Obsidian

Test plan

• Verified .obsidian/workspace.json is properly ignored
• Confirmed core-plugins.json remains tracked
• Personal config files removed from git history
• New personal settings will be automatically ignored

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