1.0.0-alpha.4

• Added a new DeployGitHubPages module.
• Moved the preview and serve commands into Statiq.Web from Statiq.App.
• Moved Statiq.GitHub into Statiq Web as Statiq.Web.GitHub from Statiq Framework.
• Moved Statiq.Netifly into Statiq Web as Statiq.Web.Netlify from Statiq Framework.
• Moved Statiq.Azure into Statiq Web as Statiq.Web.Azure from Statiq Framework.
• Moved Statiq.Aws into Statiq Web as Statiq.Web.Aws from Statiq Framework.
• Moved Statiq.Hosting into Statiq Web as Statiq.Web.Hosting from Statiq Framework.
• Moved HTML-based shortcodes from Statiq.Core.
• Fixed a bug with ArchiveKey when using a string-based key.
• Added support for setting archive document source.
• Added the GatherHeadings module.
• Added a ChildPages shortcode.
• Added shortcode support.
• Added CreateTree/FlattenTree to the Content pipeline.
• Added support for ordering documents in the Content pipeline using the "Index" metadata value.