This commit converts all of the places using ColorScheme.Gray and ColorScheme.Grayf to Muted and Mutedf.
There is a little extra tidying up with local variable names or converting code to use Mutedf format.
Found with
rg '(^ | \t|\t )' -g '*.go' -g '!*_test.go'
Mixed indent exceptions:
- wrapped long list items with extra 2-space indent
- code snippets using space indent
- commented code lines having "\t*// \t+" prefix
