Use const where possible in grunt configuration code

Gruntfile.js

@@ -113,8 +113,8 @@ module.exports = function gruntConfig(grunt) {
 				dest: '<%= paths.build %>/<%= files.cat %>',
 				options: {
 					process: (content) => {
-						let replaceRegex = /\s\/\* \[POWERTIP CODE\] \*\//,
-							coreFile = grunt.file.read(grunt.template.process('<%= concat.core.dest %>'));
+						const replaceRegex = /\s\/\* \[POWERTIP CODE\] \*\//;
+						const coreFile = grunt.file.read(grunt.template.process('<%= concat.core.dest %>'));
 						return grunt.template.process(content).replace(replaceRegex, coreFile);
 					}
 				}
@@ -128,8 +128,8 @@ module.exports = function gruntConfig(grunt) {
 				dest: '<%= paths.build %>/',
 				options: {
 					process: (content) => {
-						let scriptsRegex = /<!-- begin-scripts -->(?:.*\r?\n\s)*<!-- end-scripts -->/,
-							builtScriptTag = '<script type="text/javascript" src="../<%= files.cat %>"></script>';
+						const scriptsRegex = /<!-- begin-scripts -->(?:.*\r?\n\s)*<!-- end-scripts -->/;
+						const builtScriptTag = '<script type="text/javascript" src="../<%= files.cat %>"></script>';
 						return content.replace(scriptsRegex, grunt.template.process(builtScriptTag));
 					}
 				}
@@ -234,13 +234,13 @@ module.exports = function gruntConfig(grunt) {
 
 	// custom task to build the gh-pages index.md file
 	grunt.registerTask('build:gh-pages', 'Create the gh-pages markdown.', () => {
-		let template = grunt.file.read('doc/gh-pages.template.md'),
-			data = {
-				pkg: grunt.file.readJSON('package.json'),
-				doc: grunt.file.read('doc/README.md'),
-				changelog: grunt.file.readYAML(grunt.template.process('<%= files.changelog %>'))
-			},
-			page = grunt.template.process(template, { data: data });
+		const template = grunt.file.read('doc/gh-pages.template.md');
+		const data = {
+			pkg: grunt.file.readJSON('package.json'),
+			doc: grunt.file.read('doc/README.md'),
+			changelog: grunt.file.readYAML(grunt.template.process('<%= files.changelog %>'))
+		};
+		const page = grunt.template.process(template, { data: data });
 		grunt.file.write('dist/index.md', page);
 		grunt.log.ok('gh-pages markdown created');
 	});