GH-101: Add TODO.md to track remaining work

TODO.md

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+# GH-101 Header Redesign
+
+## Known Issues
+
+1. On CMS & Docs, there is a large gap in the navigation bar.
+2. On CMS, mobile navbar opens and closes very slowly.
+3. The portal login link is a bit too wide.
+4. The code is often difficult to follow.
+
+## New Issues
+
+- remove down arrow on mobile toggle
+- if close is issue, allow click on bottom no link area of lsit to close menu
+- remove click on portal nav toggle (for consistency with cms/search nav)
+- turn off scrolling when mobile menu is open
+- docs “Next” button is too high a z-index
+- rollover on all, do not let dropdown be clickable to return
+
+## Production Bug
+
+- Docs mobile nav not working… fix may be delayed, pending WMA CEPv2 chat