Agent Usage Web v0.2.1

Container image: leishi1313/agent-usage-web:0.2.1 (runs both exporter and web roles).

What's Changed

• docs: record v0.2.0 deployment by @LeiShi1313 in #3
• docs: record macOS exporter upgrade by @LeiShi1313 in #4
• Refresh the usage dashboard visual design by @LeiShi1313 in #5

Full Changelog: v0.2.0...v0.2.1