Replace prazdnikisegodnyaru with celebratoday, small underhood fixes

- Replace prazdnikisegodnyaru with celebratoday as first is banned in Russia
- Update .golangci.yml rule set
- Megatons of fixes for linter
- Update README.md

cmd/aleesa-webapp-go/main.go

@@ -1,3 +1,4 @@
+// Implements aleesa-web-go application.
 package main
 
 import (

cmd/celebratoday_test/main.go

@@ -0,0 +1,44 @@
+// Package main implements celebratoday api test.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"aleesa-webapp-go/internal/celebratoday"
+	"aleesa-webapp-go/internal/log"
+	"aleesa-webapp-go/internal/webapp"
+)
+
+func main() {
+	var (
+		logfile *os.File
+	)
+
+	err := webapp.ReadConfig()
+
+	if err != nil {
+		log.Errorf("Unable to parse config: %s", err)
+		os.Exit(1)
+	}
+
+	// Откроем лог и скормим его логгеру.
+	if webapp.Config.Log != "" {
+		logfile, err = os.OpenFile(webapp.Config.Log, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
+
+		if err != nil {
+			log.Errorf("Unable to open log file %s: %s", webapp.Config.Log, err)
+			os.Exit(1)
+		}
+	}
+
+	log.Init(webapp.Config.Loglevel, logfile)
+
+	str, err := celebratoday.APIClient(webapp.Config)
+
+	if err != nil {
+		fmt.Printf("Error: %s\n", err)
+	}
+
+	fmt.Println(str)
+}

cmd/flickr_init/main.go

@@ -1,3 +1,4 @@
+// Implements initialisation app for flickr service. Gains Tokens, etc.
 package main
 
 import (

cmd/flickr_populate/main.go

@@ -1,3 +1,4 @@
+// Package main get flickr oauth keys required for proper client work an stores it locally.
 package main
 
 import (

cmd/flickr_test/main.go

@@ -1,3 +1,4 @@
+// Package main ensures that oauth keys downloaded correctly and client part is working.
 package main
 
 import (