feat(doc): restructure documentation according to requirement refinement meeting

• Renaming of "Overview" to "Getting Started" in Installation Guide
• Introduced "Tested with" for all package versions in installation guide
• Created new chapter "External Dependencies" under "Other information"
• Moved "Information on Binary Packages" and "Information on Source Packages" to "External Dependencies" under "Other information"
• Removed previous "Getting Started"
• Removed meta-level "Simulator Installation Guide"
• Created section "Developer Information" and moved IDE setup instructions
• Deleted deprecated qmake build instructions
• Deleted page on Sphinx and created README.md in documentation directory instead
• Moved "Documentation Concept" to "Developer Information"
• Created "GUI Plugins" chapter in "User guide" and included all available descriptions (e.g. from overview, PCM Use case, etc.)
• Created "Tutorials" page in "User guide"
• Moved configs and outputs to own chapters right below "User Guides"
• Restructure Section "User Guides"

Based on !29 (merged) (diff shows more changes as MR is targeting servant branch but based on !29 (merged); therefore !29 (merged) should be merged first)

Closes #59 (closed)

Signed-off-by: Arun Das arun.das@bmw.de