remove unused workflows

.github/workflows/changelog.yml

@@ -1,13 +0,0 @@
-
-name: Create Changelogs
-on:
-  push:
-    branches: [ master ]
-jobs:
-  create_changelog:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-        
-      - name: Create Changelogs
-        uses: heineiuo/create-changelogs@v0.2.8

.github/workflows/trello_issue.yml

@@ -1,18 +0,0 @@
-name: Trello Issue List
-on:
-  issues:
-    types: [opened]
-env:
-  TRELLO_KEY: ${{ secrets.TRELLO_KEY }}
-  TRELLO_TOKEN: ${{ secrets.TRELLO_TOKEN }}
-  
-jobs:
-  issue_send:
-    name: Send Issue to Trello
-    runs-on: ubuntu-latest
-    steps:
-      - name: Runs trello manage
-        uses: sisodiya2421/trello-manage@master
-        with:
-          repo-name: Comty Development
-          trello-username: ${{ secrets.TRELLO_USERNAME }}

.github/workflows/validate.yml

@@ -1,17 +0,0 @@
-name: Validate code
-
-on:
-  push:
-    branches:
-      - '**'
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
-        with:
-          node-version: 12
-      - run: npm ci
-      - run: npm test