Big refactorization

- reduce complexity
- use better tools to format the code
- add more tests
- and too many things to list here

We are rewriting for V3, so these commits are sometimes big and not
fully detailed. Of course, further work will be more documented.

doc/docs/packages/generator/extrafiles.md

@@ -17,7 +17,7 @@ func NotesFile(services []string) string
 NotesFile returns the content of the note.txt file.
 
 <a name="ReadMeFile"></a>
-## func [ReadMeFile](<https://github.com/metal3d/katenary/blob/develop/generator/extrafiles/readme.go#L25>)
+## func [ReadMeFile](<https://github.com/metal3d/katenary/blob/develop/generator/extrafiles/readme.go#L24>)
 
 ```go
 func ReadMeFile(charname, description string, values map[string]any) string

doc/docs/packages/generator/labelStructs.md

@@ -158,7 +158,7 @@ func PortsFrom(data string) (Ports, error)
 PortsFrom returns a Ports from the given string.
 
 <a name="Probe"></a>
-## type [Probe](<https://github.com/metal3d/katenary/blob/develop/generator/labelStructs/probes.go#L8-L11>)
+## type [Probe](<https://github.com/metal3d/katenary/blob/develop/generator/labelStructs/probes.go#L11-L14>)
 
 
 
@@ -170,7 +170,7 @@ type Probe struct {
 ```
 
 <a name="ProbeFrom"></a>
-### func [ProbeFrom](<https://github.com/metal3d/katenary/blob/develop/generator/labelStructs/probes.go#L13>)
+### func [ProbeFrom](<https://github.com/metal3d/katenary/blob/develop/generator/labelStructs/probes.go#L16>)
 
 ```go
 func ProbeFrom(data string) (*Probe, error)