doc: update NEWS for 0.99.23 changes
release: 0.99.23
Revert "babeld: merge kernel_zebra.c into kernel.c."

This reverts commit 27f689793a25a66cf62561ac1d1302e01983a805.
Revert "babeld: Include babel_main.h in noinst_HEADERS."

This reverts commit 61a81bea6d21dedc62931d6925d0608ebc45c196.
Revert "babeld: remove "parasitic" mode."

This reverts commit 6881f2698279f3c47a55e8969860eeac59e8c3d7.
Revert "babeld: 3 more timing statements in config text"

This reverts commit cbde15513ba47f6e7f6d02fcafcfb12cd5b1df77.
Revert "babeld: consolidate zebra interface into fewer functions."

This reverts commit 5ca7986d546a1b65a4917aec0f1b594f950f7c27.
Revert "babeld: fix typo in kernel_route_add_v6."

This reverts commit b63b4484c6d2c9d304d4ddd0756a4847c6dc5359.
Revert "babeld: set interface flags eagerly, not at interface up."

This reverts commit 260948cdd6030b332137dfa0580d5a9ba651b145.
Revert "babeld: more helpful sample conf file."

This reverts commit 46b92c043f1a83d8343a4a0345a7b69bac3cdf20.
Revert "babeld: fix documentation."

This reverts commit 4d176dc07ccdcdefcd0e40043233a8c4f136f5c1.
Revert "babeld: remove remains of standalone babeld's configuration code."

This reverts commit 36329c02c36703cc2158c1c99b86045fed26d4ae.
Revert "babeld: drive interface_config_write() forward"

This reverts commit cb4b13d945a4b44282e59fa2be9ceda752420a13.
Revert "babeld: justify "running-config" meaning in CLI"

This reverts commit a14ef5eeccc8c76c41830475bbe3c31c9e14faa5.
Revert "Remove dead variable reboot_time."

This reverts commit ce590ecd85b3cf32c5429f09e12d92248cc01ef2.
Revert "doc: fix typo."

This reverts commit 8a46e12f5f0b02d58b1d7bc6c0d140aeec6c80c2.
Revert "doc: update babeld documentation."

This reverts commit 68c65a5d3a6a8cb8133b5e9311fc5dc21de88e9c.
Revert "doc: fix Makefile dependencies for babeld."

This reverts commit 173982334c978fdf2e7030d32a2cdc99587fb434.
Revert "babeld: display update-interval and resend-delay in show commands""

This reverts commit 9c298c7119c1dba6c589b8f4c358debd8e694b72.
Revert "babeld: vty commands (hello-interval, update-interval, resend-delay)."

This reverts commit c428edba5fb151844d28fbb41fce1df466a74e42.