Documentation improves

http: to https:, Review links and some menu items

Summary: First fixes from translation workflow

Test Plan: Validate links

Reviewers: #kmymoney, habacker, yurchor, ostroffjh

Reviewed By: #kmymoney, ostroffjh

Subscribers: tbaumgart, ostroffjh, kde-doc-english

Tags: #kmymoney, #documentation

Differential Revision: https://phabricator.kde.org/D27582

(cherry picked from commit b6809644)