fix: add toc to mobile views and account for branding on shared view layouts (#2997)

* fix: add toc to mobile views and center the branding

* add padding to bottom of sidebar

* put the mobile branding inline

* finesse the padding

* make spelling of sign-in email less crazy looking

* move mobile sidebar button into header

* adds scene to search and 404 pages

* fix title alignment

* make filter buttons tight

* clean up unused imports

* lint

Co-authored-by: Tom Moor <tom.moor@gmail.com>

shared/i18n/locales/en_US/translation.json

@@ -417,7 +417,7 @@
   "Search documents": "Search documents",
   "No documents found for your filters.": "No documents found for your filters.",
   "You’ve not got any drafts at the moment.": "You’ve not got any drafts at the moment.",
-  "Not found": "Not found",
+  "Not Found": "Not Found",
   "We were unable to find the page you’re looking for. Go to the <2>homepage</2>?": "We were unable to find the page you’re looking for. Go to the <2>homepage</2>?",
   "Offline": "Offline",
   "We were unable to load the document while offline.": "We were unable to load the document while offline.",
@@ -510,7 +510,6 @@
   "Include documents that are in the archive": "Include documents that are in the archive",
   "Any author": "Any author",
   "Author": "Author",
-  "Not Found": "Not Found",
   "We were unable to find the page you’re looking for.": "We were unable to find the page you’re looking for.",
   "No documents found for your search filters.": "No documents found for your search filters.",
   "Processing": "Processing",