v0.400.0-beta.2 (Holochain v0.4.0-dev.20)

What's Changed

• Return meaningful response if index.html is not found by @matthme in #213
• Enhance app settings by @matthme in #217
• Add storage info by @matthme in #218
• Real download status updates by @matthme in #212
• Edit and display publisher by @matthme in #221
• launcher config by @matthme in #227

Full Changelog: v0.400.0-beta.1...v0.400.0-beta.2