Japanese Translation (#1)

* update outdated docs

* translate "Error Correction"

* translate "Encoding"

* translate "Merge"

* translate image caption

* translate "Merge Binary String"

* translate "Advanced Usage"

* translate "Common QrCode Usage"

* translate "Usage Outside of Laravel"

* corrected notation errors

* remove advertisement

Note: I cannot be held responsible for translations of advertisements.

* add other language links and index links

* correct trivial mistakes

* add missing sections

* translate "Background Color"

* translate "Gradient"

* fix typos

* translated "EyeColor"

* translated "Style"

* translated "Eye Style"

* correct trivial mistakes

* add missing "Upgrade Guide"

* translate "Upgrade Guide"

* renew outdated "Configuration" texts

Author: kimitaka