D20389: doc: drop almost all bits related to installation

[Thomas Baumgart]

tbaumgart added a reviewer: ostroffjh.

REPOSITORY
  R261 KMyMoney

REVISION DETAIL
  https://phabricator.kde.org/D20389

To: pino, ostroffjh
Cc: #kmymoney, kde-doc-english, gennad, skadinna
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