Remove puma daemonize mode, not supported anymore

[skatkov]

Daemonization was removed from puma in 5.x version, so for this project to work locally - I had to lock puma to last 4.x version.

Here is an error i'm receiving when I try to run this locally:

> bundle exec rake server:start
>> Removing index cache pages
Traceback (most recent call last):
	14: from /home/stas/.rvm/gems/ruby-2.7.4/bin/ruby_executable_hooks:22:in `<main>'
	13: from /home/stas/.rvm/gems/ruby-2.7.4/bin/ruby_executable_hooks:22:in `eval'
	12: from /home/stas/.rvm/gems/ruby-2.7.4/bin/puma:23:in `<main>'
	11: from /home/stas/.rvm/gems/ruby-2.7.4/bin/puma:23:in `load'
	10: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/bin/puma:8:in `<top (required)>'
	 9: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/bin/puma:8:in `new'
	 8: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/cli.rb:72:in `initialize'
	 7: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/cli.rb:72:in `new'
	 6: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/launcher.rb:60:in `initialize'
	 5: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/configuration.rb:219:in `load'
	 4: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/configuration.rb:219:in `each'
	 3: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/configuration.rb:219:in `block in load'
	 2: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/dsl.rb:83:in `_load_from'
	 1: from /home/stas/.rvm/gems/ruby-2.7.4/gems/puma-5.6.4/lib/puma/dsl.rb:83:in `instance_eval'
scripts/puma.rb:9:in `_load_from': undefined local variable or method `daemonize' for #<Puma::DSL:0x00005592d6f2c858> (NameError)

[lsegal]

It might make more sense just to remove the daemonize line since it's not used in full deployment either. That seems better than regressing on versions.

[skatkov]

@lsegal this is indeed a better idea. I changed my PR accordingly, would appreciate another review.