Update gitpod config to use nf-core gitpod image and include extensions. (#1253)

.gitpod.yml

@@ -1,10 +1,14 @@
-# List the start up tasks. Learn more https://www.gitpod.io/docs/config-start-tasks/
-tasks:
-  - name: Install Nextflow
-    init: |
-      curl -s https://get.nextflow.io | bash
-      sudo mv nextflow /usr/local/bin
+image: nfcore/gitpod:latest
 
-  - name: Install pytest-workflow
-    init: |
-      pip install pytest-workflow
+vscode:
+  extensions: # based on nf-core.nf-core-extensionpack
+    - codezombiech.gitignore                 # Language support for .gitignore files
+    # - cssho.vscode-svgviewer                 # SVG viewer
+    - davidanson.vscode-markdownlint         # Markdown/CommonMark linting and style checking for Visual Studio Code
+    - eamodio.gitlens                        # Quickly glimpse into whom, why, and when a line or code block was changed
+    - EditorConfig.EditorConfig              # override user/workspace settings with settings found in .editorconfig files
+    - Gruntfuggly.todo-tree                  # Display TODO and FIXME in a tree view in the activity bar
+    - mechatroner.rainbow-csv                # Highlight columns in csv files in different colors
+    # - nextflow.nextflow                      # Nextflow syntax highlighting
+    - oderwat.indent-rainbow                 # Highlight indentation level
+    - streetsidesoftware.code-spell-checker  # Spelling checker for source code