doc: identify release version in generated docs
doc: identify release version in generated docs

It's not obvious which kernel release version you're reading about in the
documentation.  Add the version info in the breadcrumb header (instead
of "Home / Docs / Subsystems /" show as
"Home / Docs / 1.8 / Subsystems /").

(Depends on docs-theme PR-9, but can be merged now with no ill-effect)

Signed-off-by: David B. Kinder <c56c8b29908a5b2af1b63001268d73a0b7f972ba@intel.com>

zephyrproject-rtos/zephyr,rsalveti/zephyr,pklazy/zephyr,fbsder/zephyr,zephyriot/zephyr,sharronliu/zephyr,punitvara/zephyr,nashif/zephyr,sharronliu/zephyr,ldts/zephyr,mbolivar/zephyr,fractalclone/zephyr-riscv,ldts/zephyr,ldts/zephyr,ldts/zephyr,fbsder/zephyr,fractalclone/zephyr-riscv,rsalveti/zephyr,finikorg/zephyr,finikorg/zephyr,aceofall/zephyr-iotos,punitvara/zephyr,holtmann/zephyr,runchip/zephyr-cc3220,pklazy/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,fractalclone/zephyr-riscv,punitvara/zephyr,bigdinotech/zephyr,explora26/zephyr,finikorg/zephyr,punitvara/zephyr,aceofall/zephyr-iotos,kraj/zephyr,Vudentz/zephyr,aceofall/zephyr-iotos,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,explora26/zephyr,mbolivar/zephyr,holtmann/zephyr,nashif/zephyr,ldts/zephyr,nashif/zephyr,fractalclone/zephyr-riscv,holtmann/zephyr,zephyrproject-rtos/zephyr,sharronliu/zephyr,Vudentz/zephyr,kraj/zephyr,Vudentz/zephyr,zephyriot/zephyr,finikorg/zephyr,pklazy/zephyr,pklazy/zephyr,nashif/zephyr,aceofall/zephyr-iotos,bigdinotech/zephyr,zephyriot/zephyr,galak/zephyr,sharronliu/zephyr,kraj/zephyr,fbsder/zephyr,Vudentz/zephyr,runchip/zephyr-cc3220,explora26/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,rsalveti/zephyr,mbolivar/zephyr,zephyriot/zephyr,galak/zephyr,galak/zephyr,mbolivar/zephyr,mbolivar/zephyr,rsalveti/zephyr,finikorg/zephyr,bigdinotech/zephyr,fbsder/zephyr,kraj/zephyr,holtmann/zephyr,nashif/zephyr,holtmann/zephyr,aceofall/zephyr-iotos,sharronliu/zephyr,fbsder/zephyr,Vudentz/zephyr,fractalclone/zephyr-riscv,zephyriot/zephyr,runchip/zephyr-cc3220,galak/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,runchip/zephyr-cc3220,GiulianoFranchetto/zephyr,runchip/zephyr-cc3220,bigdinotech/zephyr,rsalveti/zephyr,bigdinotech/zephyr,explora26/zephyr,pklazy/zephyr