学習領域の組み換えで不要となった記事を削除

files/ja/_redirects.txt

@@ -2385,7 +2385,7 @@
 /ja/docs/Learn/JavaScript/Objects/Test_your_skills:_Object_basics	/ja/docs/Learn_web_development/Core/Scripting/Test_your_skills:_Object_basics
 /ja/docs/Learn/JavaScript/Objects/継承	/ja/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Classes_in_JavaScript
 /ja/docs/Learn/JavaScript/非同期	/ja/docs/Learn_web_development/Extensions/Async_JS
-/ja/docs/Learn/MathML	/ja/docs/conflicting/Web/MathML
+/ja/docs/Learn/MathML	/ja/docs/Web/MathML
 /ja/docs/Learn/MathML/First_steps	/ja/docs/Web/MathML/Guides
 /ja/docs/Learn/MathML/First_steps/Fractions_and_roots	/ja/docs/Web/MathML/Guides/Fractions_and_roots
 /ja/docs/Learn/MathML/First_steps/Getting_started	/ja/docs/Web/MathML/Guides/Getting_started
@@ -4585,7 +4585,7 @@
 /ja/docs/Web/JavaScript/Guide/Regular_Expressions/Groups_and_Ranges	/ja/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences
 /ja/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes	/ja/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape
 /ja/docs/Web/JavaScript/Guide/Statements	/ja/docs/Web/JavaScript/Guide/Control_flow_and_error_handling
-/ja/docs/Web/JavaScript/Guide/Text_formatting	/ja/docs/conflicting/Web/JavaScript/Guide/Numbers_and_strings
+/ja/docs/Web/JavaScript/Guide/Text_formatting	/ja/docs/Web/JavaScript/Guide/Numbers_and_strings
 /ja/docs/Web/JavaScript/Guide/Using_the_arguments_object	/ja/docs/Web/JavaScript/Guide/Functions
 /ja/docs/Web/JavaScript/Guide/Values,_variables,_and_literals	/ja/docs/Web/JavaScript/Guide/Grammar_and_types
 /ja/docs/Web/JavaScript/Guide/Variables	/ja/docs/Web/JavaScript/Guide/Grammar_and_types#declarations