In certain cases, future `tec` codes may have other side effects on the ledger. For example, `tecWASM_REJECTED` is expected to be able to modify the value of the (new) "Data" field in the Escrow ledger entry.
For better URLs, the content folder has been renamed 'docs' and all
other files have been moved up a level. Also, non-docs images have been
moved to the static folder at the top level where they belong.
Many relative paths had to be fixed to make this work.
