Documentation: use VERSION file
Documentation: use VERSION file

If the release ends with the `.90` patch we know the branch should be
master. For everything else use the release format "v{major}.{minor}".

Closes: #1805 (Documentation website title includes outdated cilium version)
Suggested-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>
Signed-off-by: Alexander Alemayhu <e46fc836cca3acec03944314d1457c2ae6c68ef3@alemayhu.com>

eloycoto/cilium,eloycoto/cilium,eloycoto/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium-team/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,scanf/cilium,tklauser/cilium,eloycoto/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,scanf/cilium,tgraf/cilium,cilium-team/cilium,tklauser/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,eloycoto/cilium,scanf/cilium