Move the github-release to the proper location

Author: alex-codefresh

plugins/github-release/README.md

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+# GitHub release Codefresh Plugin
+
+A quick plugin to cover specific use case: create releases in GitHub and upload files for them. The plugin also allows to do more complex actions overriding the command manually.
+
+## Basic usage
+
+This example creates a release and uploads files to it:
+
+```
+github_prerelease:
+        image: codefresh/cfstep-github-release
+        environment:
+          - GITHUB_TOKEN=${{GITHUB_TOKEN}}
+          - FILES=bin/app-*
+          - PRERELEASE=true
+```
+## Advanced usage
+
+If one wants to do more actions to manage releases than just to create them, it is possible to override the behaviour with custom commands:
+
+```
+github_prerelease:
+        image: codefresh/cfstep-github-release
+        commands:
+          - github-release edit --user $CF_REPO_OWNER --repo $CF_REPO_NAME --tag $CF_BRANCH_TAG_NORMALIZED --name "$CF_BRANCH_TAG_NORMALIZED"
+          - github-release delete --user $CF_REPO_OWNER --repo $CF_REPO_NAME --tag $CF_BRANCH_TAG_NORMALIZED
+          - github-release --help
+```
+
+More details about the paramaters and examples see [here](https://github.com/aktau/github-release)
+
+## Environment Variables
+
+- `GITHUB_TOKEN`: token for access to GitHub
+- `CF_REPO_OWNER`: Codefresh provided variable containing repository owner name
+- `CF_REPO_NAME`: Codefresh provided variable containing repository name
+- `CF_BRANCH_TAG_NORMALIZED`: Codefresh provided variable containing branch/tag name
+- `PRERELEASE`: If true, this variable tells the plugin to create a pre-release
+- `FILES`: A glob expression for the list of the files to be uploaded 

plugins/github-release/plugin.yaml

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+image: docker.io/codefresh/cfstep-github-release
+tag: master
+version: 0.1.0
+description: Plugin to make github releases
+keywords:
+  - github
+  - release
+home: https://github.com/codefresh-contrib/cfstep-github-release
+sources:
+  - https://github.com/codefresh-contrib/cfstep-github-release
+maintainers: 
+  - name: Alex Cheshko 
+    email: a.cheshko@codefresh.io
+icon: A URL to an SVG or PNG image to be used as an icon (optional)
+envs:
+  - name: GITHUB_TOKEN
+    type: required
+    description: Codefresh provided variable containing repository owner name
+  - name: CF_REPO_OWNER
+    type: required
+    description: Codefresh provided variable containing repository owner name
+  - name: CF_REPO_NAME
+    type: required
+    description: Codefresh provided variable containing repository name
+  - name: CF_BRANCH_TAG_NORMALIZED
+    type: required
+    description: Codefresh provided variable containing branch/tag name
+  - name: PRERELEASE
+    description: If true, this variable tells the plugin to create a pre-release
+  - name: FILES
+    description: A glob expression for the list of the files to be uploaded 
+