views: `layout`, use unique layout in `public` controller [kfl62/trst_sys_sinatra#15]
assets: css,  use unique style in modules [kfl62/trst_sys_sinatra#12]
config: `firm.yml` update
lib: `version.rb` rename (typo)
update CHANGELOG
bump version v0.2.991
Merge branch 'feature/v0.2.991' into develop, close #1