Add new translations, update nav, fix tag url, change theme info

i18n/bg.toml

@@ -0,0 +1,29 @@
+[page]
+other = "Страница"
+
+[of]
+other = "от"
+
+[newer]
+other = "По-нови"
+
+[older]
+other = "По-стари"
+
+[tagged]
+other = "Тагнати"
+
+[tags]
+other = "Тагове"
+
+[read_more]
+other = "Прочети повече..."
+
+[archive]
+other = "Архив"
+
+[noteworthy_theme]
+other = "Тема Noteworthy"
+
+[built_with_hugo]
+other = "Направено с Hugo"