Add initial configs for obsidian and copy logic for files

obsidian seems to only have a per-vault config approach, so my approach
is to define settings within .config/obsidian, then copy to vault dirs

src_files/.config/zsh/.zshenv

@@ -31,6 +31,9 @@ export ZDOTDIR="$XDG_CONFIG_HOME/zsh" # may already be set, set anyway
 # git
 export GIT_EDITOR="$EDITOR"
 
+# obsidian
+export OBSIDIAN_WORKSPACES_TO_CONFIGURE=("$DIR_NOTES")
+
 # clean-up of home dir
 export __CF_USER_TEXT_ENCODING="0x0:0x0"