Add Webtrees icon (#8595)

* Add Webtrees icon
Webtrees.net is an online genealogy tool

* Update webtrees

_data/simple-icons.json

@@ -13172,6 +13172,12 @@
             "hex": "00D564",
             "source": "https://webtoons.com"
         },
+        {
+            "title": "webtrees",
+            "hex": "2694E8",
+            "source": "https://webtrees.net",
+            "guidelines": "https://wtwi.jprodina.cz/index.php?title=Logo_webtrees"
+        },
         {
             "title": "WeChat",
             "hex": "07C160",

icons/webtrees.svg

@@ -0,0 +1 @@
+<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>webtrees</title><path d="M2.957 4.34q.647 0 1.269.243.634.243 1.093.7.459.448.662 1l1.592 4.59 1.31-3.82Q9.84 4.26 11.92 4.26q.459 0 1.106.203.729.23 1.228.809.5.58.905 1.782l1.296 3.82 1.606-4.59q.189-.54.649-.998.472-.459 1.079-.703.608-.243 1.283-.243.62.04 1.241.338.783.378 1.228 1.106.459.73.459 1.66 0 .81-.364 1.54l-4.225 8.652q-1.025 2.106-3.037 2.106-.905-.04-1.634-.567-.728-.54-1.133-1.498L12 13.72l-1.606 3.955q-.243.634-.647 1.093-.406.447-.945.702-.54.257-1.134.27-1.013 0-1.755-.486-.742-.5-1.297-1.62L.392 8.983Q0 8.16 0 7.443q0-.89.46-1.632.459-.756 1.254-1.134.622-.297 1.243-.337Z"/></svg>