Pull request 2242: 7079-log-enabled

Updates #7079.

Squashed commit of the following:

commit 477c5ed29c8066dc9cb175809572f613b2a0dfa0
Merge: d3c64e03a 647214092
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Jun 20 19:31:54 2024 +0300

    Merge branch 'master' into 7079-log-enabled

commit d3c64e03a514e39d70e6b79209be1f8cf052a25d
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Jun 20 16:02:42 2024 +0300

    home: imp docs

commit 7658c9b107f109c391b6bd5407098e8e53754842
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Jun 20 14:17:08 2024 +0300

    all: log enabled

internal/home/log.go

@@ -21,7 +21,9 @@ func configureLogger(opts options) (err error) {
 	ls := getLogSettings(opts)
 
 	// Configure logger level.
-	if ls.Verbose {
+	if !ls.Enabled {
+		log.SetLevel(log.OFF)
+	} else if ls.Verbose {
 		log.SetLevel(log.DEBUG)
 	}
 
@@ -91,7 +93,14 @@ func getLogSettings(opts options) (ls *logSettings) {
 // separate method in order to configure logger before the actual configuration
 // is parsed and applied.
 func readLogSettings() (ls *logSettings) {
-	conf := &configuration{}
+	// TODO(s.chzhen):  Add a helper function that returns default parameters
+	// for this structure and for the global configuration structure [config].
+	conf := &configuration{
+		Log: logSettings{
+			// By default, it is true if the property does not exist.
+			Enabled: true,
+		},
+	}
 
 	yamlFile, err := readConfigFile()
 	if err != nil {