add 404 error page

With the move to the new organization and upcoming page reorganization, a proper 404 "page not found" error page is helpful. The main advantage is that it includes the navigation sidebar, so even if a specific page is not available, visitors can quickly find what they're looking for.
d6n13l0l1v3r · Nov 19, 2021 · f0e9746 · f0e9746
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commit f0e9746
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+---
+permalink: /404.html
+title: RaspiBolt 404
+nav_exclude: true
+---
+
+# 404: Page not found
+
+## Damn, this link wasn't as immutable as Bitcoin.
+
+<br />
+
+<-- Check the navigation.