CONTRIBUTING: yarn -> pnpm (#9771)

CONTRIBUTING.md

@@ -44,7 +44,7 @@ Thank you for your PR! Before creating a PR, please check the following:
 - Check if there are any documents that need to be created or updated due to this change.
 - If you have added a feature or fixed a bug, please add a test case if possible.
 - Please make sure that tests and Lint are passed in advance.
-  - You can run it with `yarn test` and `yarn lint`. [See more info](#testing)
+  - You can run it with `pnpm test` and `pnpm lint`. [See more info](#testing)
 - If this PR includes UI changes, please attach a screenshot in the text.
 
 Thanks for your cooperation 🤗
@@ -102,7 +102,7 @@ If your language is not listed in Crowdin, please open an issue.
 During development, it is useful to use the 
 
 ```
-yarn dev
+pnpm dev
 ```
 
 command.
@@ -127,12 +127,12 @@ Alternatively, prepare an empty (data can be erased) DB and edit `.config/test.y
 
 Run all test.
 ```
-yarn test
+pnpm test
 ```
 
 #### Run specify test
 ```
-yarn jest -- foo.ts
+pnpm jest -- foo.ts
 ```
 
 ### e2e tests
@@ -177,9 +177,9 @@ vue-routerとの最大の違いは、niraxは複数のルーターが存在す
 これにより、アプリ内ウィンドウでブラウザとは個別にルーティングすることなどが可能になります。
 
 ## Notes
-### How to resolve conflictions occurred at yarn.lock?
+### How to resolve conflictions occurred at pnpm-lock.yaml?
 
-Just execute `yarn` to fix it.
+Just execute `pnpm` to fix it.
 
 ### INSERTするときにはsaveではなくinsertを使用する
 #6441
@@ -265,7 +265,7 @@ MongoDBは`null`で返してきてたので、その感覚で`if (x === null)`
 ### Migration作成方法
 packages/backendで:
 ```sh
-yarn dlx typeorm migration:generate -d ormconfig.js -o <migration name>
+pnpm dlx typeorm migration:generate -d ormconfig.js -o <migration name>
 ```
 
 - 生成後、ファイルをmigration下に移してください