dev: new commands system (#4412)

docs/src/docs/contributing/architecture.mdx

@@ -22,90 +22,6 @@ graph LR
 
 </ResponsiveContainer>
 
-## Init
-
-The execution starts here:
-
-```go title=cmd/golangci-lint/main.go
-func main() {
-	e := commands.NewExecutor(info)
-
-	if err := e.Execute(); err != nil {
-		fmt.Fprintf(os.Stderr, "failed executing command with error %v\n", err)
-		os.Exit(exitcodes.Failure)
-	}
-}
-```
-
-The **executer** is our abstraction:
-
-```go title=pkg/commands/executor.go
-type Executor struct {
-	rootCmd    *cobra.Command
-	runCmd     *cobra.Command
-	lintersCmd *cobra.Command
-
-	exitCode  int
-	buildInfo BuildInfo
-
-	cfg               *config.Config
-	log               logutils.Log
-	reportData        report.Data
-	DBManager         *lintersdb.Manager
-	EnabledLintersSet *lintersdb.EnabledSet
-	contextLoader     *lint.ContextLoader
-	goenv             *goutil.Env
-	fileCache         *fsutils.FileCache
-	lineCache         *fsutils.LineCache
-	pkgCache          *pkgcache.Cache
-	debugf            logutils.DebugFunc
-	sw                *timeutils.Stopwatch
-
-	loadGuard *load.Guard
-	flock     *flock.Flock
-}
-```
-
-We use dependency injection and all root dependencies are stored in this executor.
-
-In the function `NewExecutor` we do the following:
-
-1. Initialize dependencies.
-2. Initialize [cobra](https://github.com/spf13/cobra) commands.
-3. Parse the config file using [viper](https://github.com/spf13/viper) and merge it with command line arguments.
-
-The following execution is controlled by `cobra`. If a user executes `golangci-lint run`
-then `cobra` executes `e.runCmd`.
-
-Different `cobra` commands have different runners, e.g. a `run` command is configured in the following way:
-
-```go title=pkg/commands/run.go
-func (e *Executor) initRun() {
-	e.runCmd = &cobra.Command{
-		Use:   "run",
-		Short: "Run the linters",
-		Run:   e.executeRun,
-		PreRunE: func(_ *cobra.Command, _ []string) error {
-			if ok := e.acquireFileLock(); !ok {
-				return errors.New("parallel golangci-lint is running")
-			}
-			return nil
-		},
-		PostRun: func(_ *cobra.Command, _ []string) {
-			e.releaseFileLock()
-		},
-	}
-	e.rootCmd.AddCommand(e.runCmd)
-
-	e.runCmd.SetOut(logutils.StdOut) // use custom output to properly color it in Windows terminals
-	e.runCmd.SetErr(logutils.StdErr)
-
-	e.initRunConfiguration(e.runCmd)
-}
-```
-
-The primary execution function of the `run` command is `executeRun`.
-
 ## Load Packages
 
 Loading packages is listing all packages and their recursive dependencies for analysis.