Introduce Vale

[olblak]

Summary

It would be great to start using Vale to catch documentation style guide issues

Basic example

An example of a vale run

vale content/en/docs/plugins/autodiscovery/*

 content/en/docs/plugins/autodiscovery/dockerfile.adoc
 18:5     error       Did you really mean             Vale.Spelling       
                      'Dockerfile'?                                       
 18:50    error       Did you really mean             Vale.Spelling       
                      'dockerfile'?                                       
 19:77    suggestion  Spell out 'FROM', if it's       Google.Acronyms     
                      unfamiliar to the audience.                         
 26:38    suggestion  In general, use active voice    Google.Passive      
                      instead of passive voice ('be                       
                      tuned').                                            
 26:207   error       Did you really mean             Vale.Spelling       
                      'Autodiscovery'?                                    
 30:5     error       Did you really mean             Vale.Spelling       
                      'dockerfile'?                                       
 30:16    error       Did you really mean             Vale.Spelling       
                      'autodiscovery'?                                    
 34:39    warning     Avoid using 'will'.             Google.Will         
 34:83    error       Did you really mean             Vale.Spelling       
                      'dockerfile'?                                       
 36:38    error       Did you really mean 'dryrun'?   Vale.Spelling       
 37:2     error       Use 'Updatecli' instead of      Vale.Terms          
                      'updatecli'.                                        
 41:15    suggestion  In general, use active voice    Google.Passive      
                      instead of passive voice ('is                       
                      provided').      

Motivation

Executed from the CI, it would improve the quality of the documentation