Add image and CSS resources used in new Jenkins CI [networkupstools#869]

docs/images/ci/jenkins-nut.css

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+/* CSS originally based on ideas from
+ * https://medium.com/@elhayefrat/replace-jenkins-logo-and-text-to-your-choice-in-jenkinsui-f7d35daed25b
+ *
+ * Customized Jenkins+NUT logo derived from NUT resources and
+ * https://www.jenkins.io/images/logos/hyderabad/hyderabad256.png
+ * as published at https://www.jenkins.io/artwork/ collection
+ * under https://creativecommons.org/licenses/by-sa/3.0/ license
+ *
+ * Fosshost logo derived (resized to readable height in banner line)
+ * from https://fosshost.org/media/
+ */
+
+/* Custom style for Jenkins */
+.logo img {
+content:url("/userContent/layout/jenkins-nut-transparent-bg.png");
+/*
+height: 40px;
+width: auto;
+*/
+object-fit: contain;
+}
+
+#jenkins-head-icon {
+display: none;
+width: 0px;
+}
+
+#jenkins-name-icon {
+display: none;
+width: 0px;
+}
+
+#jenkins-home-link {
+padding: 1px;
+background: url("/userContent/layout/jenkins-nut-transparent-bg-40px.png") no-repeat;
+height: 40px;
+width: 54px;
+object-fit: contain;
+}
+
+.logo:after {
+content: "CI for NUT";
+font-weight: bold;
+font-size: 40px;
+/* font-family: "Brush Script MT", cursive; */
+margin-left: 20px;
+margin-right: 200px;
+color: Gold;
+line-height: 40px;
+}
+
+.logo {
+background: url("/userContent/layout/fosshost.org_Host_Dark_56px.png");
+  background-repeat: no-repeat;
+/*  background-attachment: fixed; */
+  background-position: right;
+  background-origin: content-box;
+  padding-right: 4px;
+  /* Glue to the search box, to hide FH logo plank color gap with background on the right side */
+}
+
+/* Match color of fosshost logo */
+.page-header {
+  background-color: #2a2a2a;
+}
+
+/*
+.page-footer__footer-id-placeholder {
+background: url("/userContent/layout/fosshost.org_Host_Dark_56px.png") no-repeat;
+}
+*/

docs/images/ci/jenkins-nut.txt

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+The jenkins-nut resources (images and CSS) were prepared for
+deployment of https://ci.networkupstools.org
+(C) 2021 by Jim Klimov <jimklimov@gmail.com>
+
+Customized Jenkins+NUT logo derived from NUT resources and
+https://www.jenkins.io/images/logos/hyderabad/hyderabad256.png
+as published at https://www.jenkins.io/artwork/ collection
+under https://creativecommons.org/licenses/by-sa/3.0/ license
+
+The resulting image comes in a few versions as was needed by
+different design consumers (Jenkins banner, Github Auth, etc.)
+and include the base image on white background trimmed to the
+rectangle it occupies, same on transparent background, also same
+with padding to be a square canvas (as used in avatars), and a
+downscaled image for the Jenkins dashboard banner. There are
+variants in several resolutions available, and options with a
+larger or smaller NUT logo served on the Jenkins butler's plate.
+
+The fosshost.org_Host_Dark_56px.png was downscaled from resources
+at https://fosshost.org/media/ to fit into the Jenkins dashboard
+banner and remain readable. Thanks to Fosshost for providing the
+machines involved in the new NUT CI farm!