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

src/class/config.php

@@ -0,0 +1,73 @@
+<?php // phpcs:disable WordPress.Files.FileName.InvalidClassFileName
+/**
+ * Includes the Plugin Constants class to load all Plugin constant vars like Plugin name, etc.
+ *
+ * @filesource
+ * @package footnotes
+ * @since 1.5.0
+ *
+ * @since 2.0.4  add Public Plugin name for dashboard heading
+ */
+
+/**
+ * Contains all Plugin Constants. Contains no Method or Property.
+ *
+ * @since 1.5.0
+ */
+class Footnotes_Config {
+	/**
+	 * Internal Plugin name.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	const C_STR_PLUGIN_NAME = 'footnotes';
+
+	/**
+	 * Public Plugin name.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 *
+	 * edited classes for v2.0.4
+	 */
+	const C_STR_PLUGIN_PUBLIC_NAME = '<span class="footnotes_logo footnotes_logo_part1">foot</span><span class="footnotes_logo footnotes_logo_part2">notes</span>';
+
+	/**
+	 * Public Plugin name for dashboard heading
+	 *
+	 * After properly displaying in dashboard headings until WPv5.4, the above started
+	 * in WPv5.5 being torn apart as if the headline was text-align:justify and not
+	 * the last line. That ugly display bug badly affected the plugin’s communication.
+	 * The only working solution found so far is using position:fixed in one heading
+	 * that isn’t translated, and dropping the logo in another, translatable heading.
+	 *
+	 * @since 2.0.4
+	 * @var string
+	 */
+	const C_STR_PLUGIN_HEADING_NAME = '<span class="footnotes_logo_heading footnotes_logo_part1_heading">foot</span><span class="footnotes_logo_heading footnotes_logo_part2_heading">notes</span>';
+
+	/**
+	 * Html tag for the LOVE symbol.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	const C_STR_LOVE_SYMBOL = '<span style="color:#ff6d3b; font-weight:bold;">&hearts;</span>';
+
+	/**
+	 * HTML code for the 'love' symbol used in dashboard heading
+	 *
+	 * @since 2.0.4
+	 * @var string
+	 */
+	const C_STR_LOVE_SYMBOL_HEADING = '<span class="footnotes_heart_heading">&hearts;</span>';
+
+	/**
+	 * Short code to DON'T display the 'LOVE ME' slug on certain pages.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	const C_STR_NO_LOVE_SLUG = '[[no footnotes: love]]';
+}