Documentation - add diagram "Architecture - Context diagram" #13365

Job	Run time
package-indep (debian:bookworm)	34m 39s
package-arch (ubuntu-24.04, debian:bookworm)	26m 2s
rip-and-test	25m 54s
package-arch (ubuntu-24.04-arm, debian:sid)	23m 53s
package-arch (ubuntu-24.04, debian:sid)	25m 44s
package-arch (ubuntu-24.04, debian:trixie)	26m 20s
package-arch (ubuntu-24.04-arm, debian:bookworm)	22m 0s
cppcheck	5m 45s
package-arch (ubuntu-24.04-arm, debian:trixie)	23m 58s
htmldocs	20m 6s
package-indep (debian:trixie)	33m 45s
rip-and-test-clang	22m 47s
package-indep (debian:sid)	34m 57s
Release packages	-1s
	5h 25m 49s

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