[flutter_markdown] Remove previous-repo cruft (#507)

When migrating this package from its own repository, I accidentally
included the .github directory. This serves no purpose in a
subdirectory, so should not exist.

packages/flutter_markdown/.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,24 +0,0 @@
----
-name: Bug report
-about: Create an issue to report a bug
-title: 'Bug: '
-labels: ''
-assignees: ''
-
----
-
-**Describe the bug**
-Please provide a clear and concise description of the bug.
-
-**How to reproduce**
-Steps to reproduce the behavior:
-1. 
-
-**Expected behavior**
-A description of what you expected to happen.
-
-**Screenshots**
-If applicable, add screenshots to help explain the problem.
-
-**Additional context**
-Add any other context about the problem here.

packages/flutter_markdown/.github/ISSUE_TEMPLATE/config.yml

@@ -1,3 +0,0 @@
-# Use one of the three issue templates provided. The "Other issue"
-# template should be used instead of a blank issue.
-blank_issues_enabled: false

packages/flutter_markdown/.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,20 +0,0 @@
----
-name: Feature request
-about: Suggest an feature enhancement or new functionality
-title: 'Feature: '
-labels: ''
-assignees: ''
-
----
-
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of the problem.
-
-**Describe a possible solution.**
-Do you have a possible solution or approach you think should be considered?
-
-**Describe possible alternatives.**
-Are there possible alternative solutions or features.
-
-**Additional context.**
-List any additional context or screenshots about the feature request here.

packages/flutter_markdown/.github/ISSUE_TEMPLATE/other_issue.md

@@ -1,11 +0,0 @@
----
-name: Other issue
-about: Issues that are not bugs or feature requests.
-title: ''
-labels: ''
-assignees: ''
-
----
-
-**Describe the issue**
-Please provide a clear and concise description of the issue.

packages/flutter_markdown/.github/pull_request_template.md

@@ -1,23 +0,0 @@
-**IMPORTANT: Please do not create a Pull Request without creating an issue first.**
-
-*Any change needs to be discussed before proceeding. Failure to do so may result in the rejection of the pull request.*
-
-Please provide enough information so that others can review your pull request:
-
-<!--
-Explain the **details** for making this change. What existing problem does the pull request solve? Example: When "Adding a function to do X", explain why it is necessary to have a way to do X.
--->
-
-**Test plan (required)**
-
-<!--
-Demonstrate the code is solid. Make sure all automated tests pass. New features or enhancements need an appropriate unit test. If no unit test is required, please explain why. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes UI.
--->
-
-**Closing issues**
-
-<!-- If this PR fixes open issues, put `closes #XXXX` in your comment to auto-close the issue. -->
-
-**Additional considerations**
-
-<!-- List any additional information that can help reviewers understand. -->

packages/flutter_markdown/.github/workflows/flutter_ci.yml

@@ -1,35 +0,0 @@
-name: flutter_markdown
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-  workflow_dispatch:
-  schedule:
-    - cron: '0 0 * * *' # Every day at midnight
-
-defaults:
-  run:
-    shell: bash
-
-jobs:
-  flutter-tests:
-    name: Test Flutter ${{ matrix.flutter_version }} on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        flutter_version: [dev, beta] # Disable stable until Null Safety goes stable
-        os: [ubuntu-latest, macos-latest, windows-latest]
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-java@v1
-        with:
-          java-version: '12.x'
-      - uses: subosito/flutter-action@v1
-        with:
-          channel: ${{ matrix.flutter_version }}
-      - run: flutter analyze
-      - run: flutter format --dry-run --set-exit-if-changed .
-      - run: flutter test