chore: Better CLI

[tarampampam]

Description

Changed

• version subcommand replaced by --version flag
• --config-file flag is not global anymore (use error-pages (serve|build) --config-file ... instead of error-pages --config-file ... (serve|build) ...)
• Flags --verbose, --debug and --log-json are deprecated, use --log-level and --log-format instead

Related issue: #162

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I wrote unit tests for my code (if tests are required for my changes)
• I have made changes in the CHANGELOG.md file

[codecov]

Codecov Report

Merging #163 (8404e01) into master (6a6809b) will increase coverage by 6.78%.
The diff coverage is 61.31%.

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
+ Coverage   41.81%   48.59%   +6.78%     
==========================================
  Files          32       32              
  Lines        1325     1247      -78     
==========================================
+ Hits          554      606      +52     
+ Misses        737      603     -134     
- Partials       34       38       +4     

Impacted Files	Coverage Δ
internal/cli/serve/command.go	0.00% <0.00%> (ø)
internal/env/env.go	100.00% <ø> (ø)
cmd/error-pages/main.go	52.94% <60.00%> (-47.06%)	⬇️
internal/logger/format.go	63.63% <63.63%> (ø)
internal/cli/app.go	65.11% <65.11%> (ø)
internal/cli/build/command.go	20.87% <72.72%> (+20.87%)	⬆️
internal/logger/logger.go	90.24% <84.61%> (-9.76%)	⬇️
internal/cli/healthcheck/command.go	100.00% <100.00%> (+10.00%)	⬆️
internal/logger/level.go	100.00% <100.00%> (ø)
... and 4 more

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