Move navbar CSS to its own file

www/css/landing.css

@@ -1,9 +1,4 @@
 header {
-	display: flex;
-	align-items: center;
-	justify-content: center;
-	flex-direction: column;
-
 	margin-top: 50px;
 	padding: 3vh 15vw;
 	width: 70vw;
@@ -12,8 +7,10 @@ header {
 }
 
 header .logo {
+	display: block;
 	width: 24vh;
 	height: 24vh;
+	margin: auto;
 }
 
 main {
@@ -23,8 +20,8 @@ main {
 .info {
 	text-align: center;
 	width: 100%;
-	padding: 0 0;
-	margin-top: 0;
+	padding: 0;
+	margin: 0;
 
 	overflow-y: hidden;
 }
@@ -32,11 +29,11 @@ main {
 .essentials {
 	width: 100%;
 	margin: 1.8em 0;
-	padding: .2em 0;
+	padding: 0;
 	list-style: none;
 	display: flex;
-	justify-content: center;
 	align-items: center;
+	justify-content: center;
 }
 
 .essentials li {