Refactor config package

- Parse configuration only once during startup time
- Store configuration values in a global variable

ui/logout.go

@@ -7,6 +7,7 @@ package ui // import "miniflux.app/ui"
 import (
 	"net/http"
 
+	"miniflux.app/config"
 	"miniflux.app/http/cookie"
 	"miniflux.app/http/request"
 	"miniflux.app/http/response/html"
@@ -32,8 +33,8 @@ func (h *handler) logout(w http.ResponseWriter, r *http.Request) {
 
 	http.SetCookie(w, cookie.Expired(
 		cookie.CookieUserSessionID,
-		h.cfg.IsHTTPS,
-		h.cfg.BasePath(),
+		config.Opts.HTTPS,
+		config.Opts.BasePath(),
 	))
 
 	html.Redirect(w, r, route.Path(h.router, "login"))