ci: improve release process, clean up and re-org repo, add automated minification (#143)

* ci: update scripts

* release 2.7.1

* remove tracked stylesheets

* docs: revert stable tag to 2.7.0

* chore: move Plugin source into own dir

* docs: delete info texts

These can now be found in the [project wiki][wiki].

[wiki]: https://github.com/markcheret/footnotes/wiki

* docs: tweak contributing guide

* ci: reflect new directory structure

* chore: update gitignore

* chore: reflect new dir structure

* docs: update documentation

* build(linting): add Husky hooks, Markdown linting, lint all MD files

* fix pre-push command

* fix pre-push command

* build: add stylesheet, JS minification

* ci: add linting steps

* ci: comment out CSS linting step (that's going to be a whole *thing*)

* ci: minify all JS files

* ci: call correct JS file

* chore: lint

* ci: fix PHP linting commands

* chore: increment version constant string

* ci: concat AMP stylesheets

* ci: improve build scripts

* chore: add assets dir

.github/workflows/php.yml

@@ -34,10 +34,12 @@ jobs:
 
     - name: Lint JS code
       run: composer run format:js:fix && composer run lint:js
-    
-    # TODO: Fix CSS errors
-    #- name: Format and lint CSS code
+
+    #- name: Lint stylesheets
     #  run: composer run lint:css
+
+    - name: Lint Markdown files
+      run: composer run lint:md
     
     # TODO: Add tests
     # - name: Run test suite

.github/workflows/release-handler.yml

@@ -20,7 +20,7 @@ jobs:
           
       - name: Build Plugin
         run: |
-          composer run build -- -y
+          composer run build
           
       - name: Rename dist/ folder
         run: |