White-label: title/logo now driven by conf (closes #6)

conf.name was already plumbed into routes/index.js's values object,
but never actually rendered anywhere -- <title>, the navbar brand,
and the favicon were all still hardcoded "SSO - Theta 42"/"SSO
Manager". Now render <%- name %>/<%- logo %> in top.ejs; new
conf.logo key (default: the existing theta42.svg) drives the navbar
image and favicon.

Also fixes a pre-existing broken favicon: top.ejs referenced
/static/favicon.svg, which was never actually served from public/ --
only public/img/theta42.svg existed. The favicon now uses that same
file via conf.logo instead of a nonexistent path.

Footer copyright/logo/GitHub links are left as-is (open-source
attribution, not deployment branding).

nodejs/conf/base.js

@@ -9,6 +9,7 @@
 // `app_*` env vars — never commit them here.
 module.exports = {
 	name: "SSO Manager", // displayed in the UI and outbound email
+	logo: "/static/img/theta42.svg", // shown in the nav/footer; point at your own file under public/ (or an absolute URL) to white-label
 	userModel: 'ldap', // pam, redis, ldap
 	redis: {
 		prefix: 'sso_manager_'