gnucash-docs maint: Link new screens completely in C and partially in de

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/5ca94b1d (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/c61643dd (commit)



commit 5ca94b1d0ce84429436000182e5969c3d2650200
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Sun Jun 20 14:39:04 2021 +0200

    Link new screens completely in C and partially in de



Summary of changes:
 help/C/Help_ch_Customize.xml       | 1016 ++++++++++++++----------------------
 help/C/Help_ch_GettingStarted.xml  |  358 ++++++-------
 help/de/Help_ch_GettingStarted.xml |  435 +++++++--------
 3 files changed, 738 insertions(+), 1071 deletions(-)