v2.0.0.beta4

• Require bridgetown when booting from Rack #948 (@ayushn21)
• Remove explicit require of puma in the console command #947 (@ayushn21)
• Refactor Roda plugin setup, add Roda "distribution" docs #969 (@jaredcwhite)
• Revamp the minitesting bundled configuration so it uses Rack::Test #954 (@jaredcwhite)
  • BREAKING CHANGE: the flash plugin is no longer loaded by the file-based routes plugin by default, it's now configured with sessions: true in the ssr plugin init. Flash required sessions to be set up anyway, which used to be manual but is now provided by this new config.
• Remove legacy doctor command #966 (@jaredcwhite)
• Better inspect output for Bridgetown::Collection #968 (@jaredcwhite)
• Add Viewable callable object mixin for Ruby components #959 (@jaredcwhite)
• Add irb gem as a dependency (@jaredcwhite)
• Add Enumerable to Paginator #967 (@jaredcwhite)
• Ensure symbol values for relations config still work (@jaredcwhite)
• docs: Add some file excludes for YARDoc generation #964 (@jaredcwhite)
• Show generic index file instead of crashing #963 (@jaredcwhite)
• Support minimalist installations with no config.ru or Rakefile (or anything other than Gemfile really) #942 (@jaredcwhite)
• Switch to .bridgetown-cache/live_reload.txt for live reload #949 (@jaredcwhite)
• Cache instantiated template objects for ERB and Serbea #958 (@jaredcwhite)
• Preserve the _bridgetown default value in keep_files config #945 (@jaredcwhite)
• Add back in "Now serving", fix absolute URL bug in dev, fix missing 404 (@jaredcwhite)
• Ensure front matter defaults are dot access hashes #944 (@jaredcwhite)
• Avoid duplication in r.bridgetown implementation #939 (@jeremyevans)
• Update gh_pages bundled configuration #943 (@konnorrogers)

Contributors: @ayushn21, @KonnorRogers, @jeremyevans, & @jaredcwhite