Improved documentation with: (#166)

- Added C17, C23 language options
(Open-CMSIS-Pack/devtools#1703)
- Added trustzone: secure-only
(Open-CMSIS-Pack/devtools#1715)
- execute: id is a job name mapped to file
(Open-CMSIS-Pack/devtools#1561)
- access sequences to other projects require context-set
(Open-CMSIS-Pack/devtools#1715)
- added Linker Script configuration
- Added IDE Usage information
- Clarified usage of --output option
(Open-CMSIS-Pack/devtools#1710)
- Worked on section "Create Applications"
(Open-CMSIS-Pack/devtools#1189)
- Added note about context name
(Open-CMSIS-Pack/devtools#1731)

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Co-authored-by: Joachim Krech <[email protected]>