Update navigation to accordian-style menu

- New navigation provides intuitive structure for showing relationship
between sections and pages
- Menu keeps an open state, which allows easy clicking to sibling pages
- Ability to preview all page sections w/o hover over blocking page content
- Allows user to see where they are within navigation at all times

Tested: Opened each page and confirmed new navigation worked, clicked through
to all pages successfully.

Change-Id: Ie10dc95d8e15ee9bf89a3bec9ff231c0a7065ed9
Signed-off-by: Kathy Pine <kathryn.elainex.pine@intel.com>
diff --git a/app/assets/icons/icon-overview.svg b/app/assets/icons/icon-overview.svg
index 748fa81..0b42642 100644
--- a/app/assets/icons/icon-overview.svg
+++ b/app/assets/icons/icon-overview.svg
@@ -1 +1 @@
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\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32"><path fill="#ffffff" d="M4 2H2v26a2 2 0 0 0 2 2h26v-2H4z"/><path fill="#ffffff" d="M30 9h-7v2h3.59L19 18.59l-4.29-4.3a1 1 0 0 0-1.42 0L6 21.59 7.41 23 14 16.41l4.29 4.3a1 1 0 0 0 1.42 0l8.29-8.3V16h2z"/><path data-name="&lt;Transparent Rectangle&gt;" fill="none" d="M0 0h32v32H0z"/></svg>
\ No newline at end of file