docs: add missing actions #264
                
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I found a lot of missing actions in the documentation & a lot of missing options (some of which are present in the default config).
I have added all of them by going through: https://github.com/zellij-org/zellij/blob/main/zellij-utils/src/kdl/mod.rs#L1280-L1808 except
MessagePluginId, which seemed like it was for internal use.