Refine language and fix punctuation in markdown documentation

[EthanolWe]

Hello, I'm a first-time contributor and I was wondering if you would be interested me cleaning up some of the markdown documentation with in the /docs file directory.

Some of the things I would like to change:

• Changing the "!!! info" at the bottom of the /usage/config.md
• Changing the "!!! note" at the bottom of index.md
• Remove / change the {width=200} under the image in index.md.
• Making the "Klepto is a tool for copying and anonymising data." more pronounced / fixing the spelling to anonymizing.
• In commands.md, change the header "Command" to "Commands" to match the file name.
• In commands.md, add punctuation to match the other markdown files.
   
  These were just some of the ideas that I have. Please give me feedback!

[EthanolWe]

I made a pull request for this issue. See: #181