Add obsidian related fish functions.

fish/functions/od.fish

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+# Defined in - @ line 1
+function od --wraps='nvim +ObsidianToday' --description 'alias od=nvim +ObsidianToday'
+    nvim +ObsidianToday
+
+end

fish/functions/ot.fish

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+# Defined in - @ line 1
+function od --wraps='nvim +ObsidianTomorrow' --description 'alias od=nvim +ObsidianTomorrow'
+    nvim +ObsidianTomorrow
+
+end

fish/functions/oy.fish

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+# Defined in - @ line 1
+function od --wraps='nvim +ObsidianYesterday' --description 'alias od=nvim +ObsidianYesterday'
+    nvim +ObsidianYesterday
+
+end