* Added .deepsource.toml
* Removed bad use of `alias`
* Fixed operand order in the binary expression
* Prefixed unused method arguments with an underscore
* Replaced the old OpenSSL algorithmic constants with the newer strings initializers.
* Removed unnecessary UTF-8 encoding comment
* disable NewCops
* update TargetRubyVersion
* Fix Lint/MissingSuper for ActiveModelSerializers::Model
* Fix Lint/MissingSuper for feed
* Fix Lint/FloatComparison
* Do not use instance variables
* Fix contrast calculation for thumbnail color extraction
Luminance calculation was using 0-255 RGB values instead of 0-1 sRGB values,
leading to incorrectly-computed contrast values.
Since we use ColorDiff already, just use its XYZ colorspace conversion code
to get the value.
* Require at least 3:1 contrast for both accent and foreground colors
* Lower required contrast for the accent color