v1.0.0.alpha8

Changes since alpha7:

• Refactor builder DSL for Ruby 2.7 & 3.0 compatibility

Changes since alpha6:

• Update minimum Ruby requirement to 2.7
• Copy bin/bridgetown to bin/bt after binstubs generation
• Ensure Webpack error messages only display once
• Add bundled configuration for Cypress #339 (ayushn21)
• Use Zeitwerk for autoload/eager load paths (including plugins) #434 (jaredcwhite & ayushn21)
• Don't mutate bundler dependencies in place #433 (deivid-rodriguez)
• Add bundled configuration for Render #431 (ayushn21)