Add source URL comments to standardized assets

This will make it easier for the maintainers to sync fixes and improvements in either direction between the upstream
"template" assets and their installation in this repository.

Author: per1234

.codespellrc

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check/.codespellrc
 # See: https://github.com/codespell-project/codespell#using-a-config-file
 [codespell]
 # In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here:

.github/workflows/check-license.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-license.md
 name: Check License
 
 env:

.github/workflows/check-markdown-task.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-markdown-task.md
 name: Check Markdown
 
 # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows

.github/workflows/check-prettier-formatting-task.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-prettier-formatting-task.md
 name: Check Prettier Formatting
 
 # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows

.github/workflows/spell-check-task.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/spell-check-task.md
 name: Spell Check
 
 env:

.markdownlint.yml

@@ -1,4 +1,7 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-markdown/.markdownlint.yml
 # See: https://github.com/DavidAnson/markdownlint/blob/main/doc/Rules.md
+# The code style defined in this file is the official standardized style to be used in all Arduino projects and should
+# not be modified.
 # Note: Rules disabled solely because they are redundant to Prettier are marked with a "Prettier" comment.
 
 default: false

Taskfile.yml

@@ -73,6 +73,7 @@ tasks:
       - wget --quiet --output-document="{{.ACTION_METADATA_SCHEMA_PATH}}" https://json.schemastore.org/github-action
       - npx ajv-cli validate --strict=false -s "{{.ACTION_METADATA_SCHEMA_PATH}}" -d "action.yml"
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-markdown-task/Taskfile.yml
   markdown:lint:
     desc: Check for problems in Markdown files
     cmds:
@@ -84,6 +85,7 @@ tasks:
     cmds:
       - npx markdownlint-cli --fix "**/*.md"
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-markdown-task/Taskfile.yml
   markdown:check-links:
     desc: Check for broken links
     deps:
@@ -132,13 +134,15 @@ tasks:
     cmds:
       - npx prettier --write .
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check-task/Taskfile.yml
   general:check-spelling:
     desc: Check for commonly misspelled words
     deps:
       - task: poetry:install-deps
     cmds:
       - poetry run codespell
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check-task/Taskfile.yml
   general:correct-spelling:
     desc: Correct commonly misspelled words where possible
     deps: