Issue #254 Added Quick Start first steps directly to Restructured Text.
Issue #254 Update and polish summarizing first steps.
Issue #254 Pair Quick Start menu item with Overview.

Given that the First Steps contain the same information as the download and installation pages, only more concise, it seems to be appropriate to separate them from these and rather make them the two top menu items for new (inpatient) users.
Issue #254 Rearrange sidebar items on web page once more.

With the new order, using the "next" button in the top right corner should lead the user through the documentation in the recommended sequence. The detailed download and installation pages are at the bottom as these are not needed if one follows the First Steps given in the Quick Start section.
Issue #254 Separate pages for documentation of standards.
Issue #254 Clarify that programming guidelines do not have to apply to every organization.
Issue #254 Add labels to CMake options in the attempt to fix issue with Sphinx <previous>/<next>.
Issue #254 Replace "like" by "such as".
Issue #254 Change caption of API reference to "Developer Reference".
Issue #254 Rephrase help page to make a one-liner.
Issue #254 Exclude history from PDF output (manual).
Issue #254 Update PDF manual included in source tree.
Issue #254 Some minor improvements of First Steps.

In particular make it fit better on the A4 pages of the PDF.
Issue #254 Make Advanced CMake Options a sub-section of CMake Options.
Issue #254 Change menu name for full TOC.
Issue #254 Reorganize documents detailing the standard and guidelines according to Andrew's suggestions.
Issue #254 Minor change of latest change log entries to avoid additional vertical spacing between list items due to the use of sub-lists.
Issue #254 Minor change of heading.
Issue #254 Minor improvements of standard related pages.
Issue #254 Change heading of full TOC back.

The "Documentation" looked nicer in the top left when navigating through the documents, but actually when clicking on it I am directed back to the full TOC. So "Table of Contents" is more obvious to where this link takes me.