Log Message:
gnucash-docs: update to 5.5.

 5.5   - 17 December 2023
       o EBICS: for business customers (of the bank) rather than business users.
       o docbook: additional entities for business GUI-elements</li>
       o docbook: gnc-gui-*: Rename the scheduled edit/new/delete menus to
         match a change in the program.
 5.4   - 24 September 2023
       o Bug 799074 - Incorrect note re cash page in stock-txn-assistant
       o Add a Chinese translation for the Tutorial and Concepts Guide.
       o Update git branches for API docs
       o Refactor the build system feature for adding customized xslt files.
       o Bump minimum cmake version to 3.14 to keep it in sync with the
         gnucash repo
       o Fix race condition in creating symlinks for the kde help system.
       o Update GitHub actions/checkout to v3 in all actions and add
         nightly-build github workflow.
       o Manual (C,de): Replace obsolete 'gnc-fq-*' with
         'gnucash-cli --quotes *'
       o Guide (C,de,ru): Repair broken links from 'help' to 'manual'
       o Guide (C,de), ch_invest: Remove section 'Finance::Quote install'
       o Manual (C, de) Update F::Q screens to 1.57
       o Change version 4 to 5, branch maint to stable, and update
         Finance::Quote docs to reflect changes in GnuCash.
       o New and Updated Translations: German