Add Helper getDocs()

#10

Helper/ApplicationBrandingHelper.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Kanboard\Plugin\ApplicationBranding\Helper;
+
+use Kanboard\Core\Base;
+
+class ApplicationBrandingHelper extends Base
+{
+    public function getDocs($label, $file)
+    {
+        // GET HELP DOCS
+        $version = 'latest';
+
+        if (substr(APP_VERSION, 0, 1) === 'v') {
+            $version = substr(APP_VERSION, 1);
+        } else if (ctype_digit(substr(APP_VERSION, 0, 1))) {
+            $version = APP_VERSION;
+        }
+
+        $url = sprintf(DOCUMENTATION_URL_PATTERN, $version, $file);
+        return sprintf('
+            <a href="%s" class="channels-link" title="'. t('Opens in a new window') .'" rel="noopener noreferrer" target="_blank">
+                <div class="icon-wrapper wrapper-docs">
+                    <svg version="1.0" width="20px" height="20px" class="kanboard-icon" fill="currentColor" viewBox="0 0 144 144" preserveAspectRatio="xMidYMid meet" xmlns="http://www.w3.org/2000/svg">
+                        <g transform="translate(0.000000,144.000000) scale(0.100000,-0.100000)" fill="#000000" stroke="none">
+                            <path fill="#000000" d="M820 704 l0 -525 208 3 c204 3 208 3 260 31 91 48 135 132 135 257 -1 123 -46 212 -127 252 l-44 21 41 21 c56 28 86 84 94 174 8 99 -14 167 -71 220 -66 61 -116 72 -323 72 l-173 0 0 -526z m375 392 c50 -21 75 -68 75 -141 0 -72 -14 -102 -59 -132 -31 -21 -45 -23 -157 -23 l-124 0 0 155 0 155 115 0 c78 0 127 -5 150 -14z m33 -441 c52 -32 75 -90 71 -185 -4 -88 -21 -120 -78 -154 -27 -16 -54 -19 -159 -20 l-127 -1 -3 193 -2 194 132 -4 c111 -2 139 -6 166 -23z"/>
+                            <path fill="#d40000" d="M90 705 l0 -515 90 0 90 0 2 201 3 201 139 -197 c77 -108 145 -199 151 -201 6 -3 59 -3 117 -2 l105 3 -188 265 c-104 146 -186 271 -184 278 3 7 76 113 163 235 87 122 162 228 166 235 6 9 -17 12 -98 12 l-105 0 -133 -186 -133 -186 -3 186 -2 186 -90 0 -90 0 0 -515z"/>
+                        </g>
+                    </svg>
+                </div> %s
+            </a>', $url, $label);
+    }
+}