sort go imports

[ccoVeille]

• chore: sort go imports
• ci: add gci to golangci-lint
• chore: update (and sometimes fix) the examples in documentation
• chore: format Markdown block with mdsf

The idea is to use the following pattern

import (                                                                                                                                                                                   
        // std lib imports                                                                                                                                                                     

        // third party imports                                                                                                                                                                 

        // package imports from fuego                                                                                                                                                          
)                                                                                                                                                                                          

More information about this in the following discussion

184

[ccoVeille]

I added 2 commits, please review them

I used mdsf, which provide a good result

[ccoVeille]

Please look at what I said here

https://github.com/go-fuego/fuego/discussions/184#discussioncomment-10511397

gopls can be configured with formatting.local

[ccoVeille]

Also if the CI fails, gci will provide the exact command line to run to fix the issues

Also, golangci-lint can be run with --fix to format the files.

So, it's only a matter of documentation

[EwenQuim]

Perfect!

Thanks