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

js/wysiwyg-editor.js

@@ -1,78 +0,0 @@
-/**
- * Created by Stefan on 24.05.14.
- *
- * Edit: be careful to maintain version number near EOF
- */
-
-(function () {
-  tinymce.create('tinymce.plugins.Footnotes', {
-    /**
-     * Initializes the plugin, this will be executed after the plugin has been created.
-     * This call is done before the editor instance has finished its initialization so use the onInit event
-     * of the editor instance to intercept that event.
-     *
-     * @param {tinymce.Editor} ed Editor instance that the plugin is initialized in.
-     * @param {string} url Absolute URL to where the plugin is located.
-     */
-    init: function (ed, url) {
-      ed.addButton('footnotes', {
-        title: 'footnotes',
-        cmd: 'footnotes',
-        image: url + '/../img/fn-wysiwyg.png',
-      });
-
-      ed.addCommand('footnotes', function () {
-        jQuery.ajax({
-          type: 'POST',
-          url: './admin-ajax.php',
-          data: {
-            action: 'footnotes_getTags',
-          },
-          success: function (data, textStatus, XMLHttpRequest) {
-            var tags = JSON.parse(data);
-            var returnText = tags.start + ed.selection.getContent() + tags.end;
-            ed.execCommand('insertHTML', true, returnText);
-          },
-          error: function (MLHttpRequest, textStatus, errorThrown) {
-            console.log('Error: ' + errorThrown);
-          },
-        });
-      });
-    },
-
-    /**
-     * Creates control instances based on the incoming name. This method is normally not
-     * needed since the addButton method of the tinymce.Editor class is an easier way of adding buttons,
-     * but you sometimes need to create more complex controls like listboxes, split buttons etc then this
-     * method can be used to create those.
-     *
-     * @param {String} n Name of the control to create.
-     * @param {tinymce.ControlManager} cm Control manager to use in order to create new control.
-     * @return {tinymce.ui.Control} New control instance or null if no control was created.
-     */
-    createControl: function (n, cm) {
-      return null;
-    },
-
-		/**
-		 * Returns information about the plugin as a name/value array.
-		 * The current keys are longname, author, authorurl, infourl and version.
-		 *
-		 * @return {Object} Name/value array containing information about the plugin.
-		 *
-		 * Edit: needs updating the version number manually   
-		 */
-		getInfo : function() {
-			return {
-				longname : 'Inserts the Footnotes short code.',
-				author : 'Mark Cheret',
-				authorurl : 'https://cheret.org/footnotes/',
-				infourl : 'https://wordpress.org/plugins/footnotes/',
-				version : '2.7.1d'
-			};
-		}
-	});
-
-  // Register plugin
-  tinymce.PluginManager.add('footnotes', tinymce.plugins.Footnotes);
-})();