Add secondary navbar. Add jinja if for jumbotron bg and secondary navbar

src/styles/_cards.sass

@@ -1,5 +1,6 @@
 .container.card-container
 	max-width: 1200px
+	margin-top: 56px
   // pending media query decision
 	// .col-md-4
 	// 	+media-breakpoint-up(lg)

src/styles/_navbar-secondary.sass

@@ -0,0 +1,36 @@
+.nav-scroller
+	position: relative
+	z-index: 2
+	height: 2.75rem
+	overflow-y: hidden
+.navbar-secondary
+	max-width: 700px
+	margin-bottom: 56px
+	padding-left: 0
+	border-bottom: 1px solid $gray
+	.nav
+		display: flex
+		flex-wrap: nowrap
+		overflow-x: auto
+		text-align: center
+		white-space: nowrap
+		-webkit-overflow-scrolling: touch
+	.nav-link
+		font-size: 18px
+		color: $dark
+		padding: 13px 4px
+		margin-right: 16px
+		margin-left: 16px
+		&:hover
+			color: $muted
+	.nav-title
+		font-weight: 600
+		@include media-breakpoint-up(md)
+			padding-left: 0
+			margin-left: 0
+		&:hover
+			color: $dark
+	.active
+		border-bottom: 2px solid $primary
+		&:hover
+			color: $dark

src/styles/_navbar.sass

@@ -4,6 +4,9 @@
   min-height: 48px
   +media-breakpoint-up(md)
     height: 56px
+  &.sticky-top
+    +media-breakpoint-down(sm)
+      position: static
   .logo
     display: flex
     justify-content: center

src/styles/projects-index-collection.sass

@@ -3,9 +3,6 @@
 @import ../styles/custom-font
 @import ../styles/navbar
 @import ../styles/jumbotron
+@import ../styles/navbar-secondary
 @import ../styles/cards
-@import ../styles/footer
-
-.jumbotron
-	background-image: url('/../../static/assets/img/backgrounds/banner-open-projects.jpg')
-	margin-bottom: 56px
+@import ../styles/footer