doc: devchallengesへのリンクをlegacyサブドメインに移行(#11)

README.md

@@ -3,7 +3,7 @@
 <h1 align="center">My Gallery</h1>
 
 <div align="center">
-   Solution for a challenge from  <a href="http://devchallenges.io" target="_blank">Devchallenges.io</a>.
+   Solution for a challenge from  <a href="http://legacy.devchallenges.io" target="_blank">Devchallenges.io</a>.
 </div>
 
 <div align="center">
@@ -12,11 +12,11 @@
       Demo
     </a>
     <span> | </span>
-    <a href="https://devchallenges.io/solutions/Yf7HiQpP7rAXzM1euefq">
+    <a href="https://legacy.devchallenges.io/solutions/Yf7HiQpP7rAXzM1euefq">
       Solution
     </a>
     <span> | </span>
-    <a href="https://devchallenges.io/challenges/gcbWLxG6wdennelX7b8I">
+    <a href="https://legacy.devchallenges.io/challenges/gcbWLxG6wdennelX7b8I">
       Challenge
     </a>
   </h3>
@@ -60,7 +60,7 @@ Base
 
 <!-- List the features of your application or follow the template. Don't share the figma file here :) -->
 
-This application/site was created as a submission to a [DevChallenges](https://devchallenges.io/challenges) challenge. The [challenge](https://devchallenges.io/challenges/gcbWLxG6wdennelX7b8I) was to build an application to complete the given user stories.
+This application/site was created as a submission to a [DevChallenges](https://legacy.devchallenges.io/challenges) challenge. The [challenge](https://legacy.devchallenges.io/challenges/gcbWLxG6wdennelX7b8I) was to build an application to complete the given user stories.
 
 - [x] User story: I can see a page following the given design
 

index.html

@@ -8,7 +8,7 @@
     <title>My Gallery</title>
     <meta
       name="description"
-      content="devChallenges.io - My Gallery | by h-yoshikawa44"
+      content="devChallenges.io(legacy) - My Gallery | by h-yoshikawa44"
     />
     <link rel="icon" type="image/png" href="/favicon.png" />