Add dark-mode & Turris icons

css/dark-mode.css

+/*
+ * Copyright (c) 2020 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+ *
+ * This is free software, licensed under the GNU General Public License v3.
+ * See /LICENSE for more information.
+ */
+
+[data-theme="dark"] {
+    background-color: #111 !important;
+    color: rgb(209, 205, 199);
+}
+
+[data-theme="dark"] .bg-light {
+    background-color: #333 !important;
+}
+
+[data-theme="dark"] .bg-white {
+    background-color: #000 !important;
+}
+
+[data-theme="dark"] .bg-black {
+    background-color: #eee !important;
+}
+
+[data-theme="dark"] a img,
+[data-theme="dark"] .card .card-img-top {
+    filter: invert(0.6);
+}
+
+[data-theme="dark"] .progress {
+    background-color: rgb(35, 38, 39);
+}
+
+[data-theme="dark"] .card {
+    background-color: rgb(24, 26, 27);
+    border-color: rgba(140, 130, 115, 0.13);
+}
+
+[data-theme="dark"] .border-bottom {
+    border-bottom-color: white !important;
+}
+
+[data-theme="dark"] .badge-primary,
+[data-theme="dark"] .progress-bar {
+    color: rgb(232, 230, 227);
+    background-color: rgb(0, 98, 204);
+}
+
+[data-theme="dark"] .text-dark {
+    color: rgb(195, 190, 182) !important;
+}
+
+[data-theme="dark"] .custom-control-label::before {
+    background-color: rgb(24, 26, 27);
+    border-color: rgb(69, 75, 78);
+}
+
+[data-theme="dark"]
+    .custom-control-input:checked
+    ~ .custom-control-label::before {
+    color: rgb(232, 230, 227);
+    border-color: rgb(0, 86, 179);
+    background-color: rgb(0, 98, 204);
+}
+
+[data-theme="dark"]
+    .custom-switch
+    .custom-control-input:checked
+    ~ .custom-control-label::after {
+    background-color: rgb(24, 26, 27);
+}

icons/turris-dark.svg

+<svg height="35" viewBox="0 0 184 47" width="140" xmlns="http://www.w3.org/2000/svg"><path d="m184 13.1904563c-1.131621-1.0378549-2.449857-1.822762-3.95343-2.3534396-1.505277-.5311048-2.979025-.7968709-4.422949-.7968709-1.204478 0-2.395747.1508287-3.574661.452486-1.179766.3025118-2.239382.7784979-3.177571 1.4300948-.93904.6520241-1.697005 1.4847862-2.274745 2.4987136s-.86661 2.2329476-.86661 3.6566332c0 1.1592015.186615 2.1432195.559846 2.9516269.372804.8088346.867036 1.4967499 1.480139 2.063746.614382.5674233 1.311845 1.0323003 2.094521 1.3937763.781824.3623306 1.582394.6759516 2.401286.9417177.841898.2653387 1.593898.5131592 2.256424.7421794.661674.2298749 1.214703.4828226 1.660364.7605524.445235.2777298.788641.585369 1.02894.9229175.240299.3384031.3613.7490159.3613 1.2314112 0 .50675-.096716.9412904-.28887 1.3036209-.19258.3623306-.451199.6515969-.776285.8690807-.325085.2166292-.703854.3747215-1.137159.4704315-.433305.0969918-.87854.145274-1.336131.145274-1.010619 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icons/turris-light.svg

+<svg height="35" viewBox="0 0 184 47" width="140" xmlns="http://www.w3.org/2000/svg"><path d="m184 13.1904563c-1.131621-1.0378549-2.449857-1.822762-3.95343-2.3534396-1.505277-.5311048-2.979025-.7968709-4.422949-.7968709-1.204478 0-2.395747.1508287-3.574661.452486-1.179766.3025118-2.239382.7784979-3.177571 1.4300948-.93904.6520241-1.697005 1.4847862-2.274745 2.4987136s-.86661 2.2329476-.86661 3.6566332c0 1.1592015.186615 2.1432195.559846 2.9516269.372804.8088346.867036 1.4967499 1.480139 2.063746.614382.5674233 1.311845 1.0323003 2.094521 1.3937763.781824.3623306 1.582394.6759516 2.401286.9417177.841898.2653387 1.593898.5131592 2.256424.7421794.661674.2298749 1.214703.4828226 1.660364.7605524.445235.2777298.788641.585369 1.02894.9229175.240299.3384031.3613.7490159.3613 1.2314112 0 .50675-.096716.9412904-.28887 1.3036209-.19258.3623306-.451199.6515969-.776285.8690807-.325085.2166292-.703854.3747215-1.137159.4704315-.433305.0969918-.87854.145274-1.336131.145274-1.010619 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js/dark-mode-switch.min.js

+!function(){var t,e=document.getElementById("darkSwitch");if(e){t=null!==localStorage.getItem("darkSwitch")&&"dark"===localStorage.getItem("darkSwitch"),(e.checked=t)?document.body.setAttribute("data-theme","dark"):document.body.removeAttribute("data-theme"),e.addEventListener("change",function(t){e.checked?(document.body.setAttribute("data-theme","dark"),localStorage.setItem("darkSwitch","dark")):(document.body.removeAttribute("data-theme"),localStorage.removeItem("darkSwitch"))})}}();