Version 3.0.0 alpha 6

• Bundle web-ui v3.0.0a6
• Upgrade to aiohttp v3.9.0rc0
• Install Docker resources in writable location
• Default compute username is "gns3"
• Non-blocking checksums computation when server starts. Fixes #2228
• Fix timeout issue when creating Qemu disk image. Fixes #2313
• Fix broken link to Web UI in 3.0 branch. Fixes #2312
• Fix sample config: VMware section declared twice. Fixes #2311
• Fix ws console and packet capture over SSL
• Support for web socket console over HTTPS
• Allow disabling hardware virtualization check