neovim: Add obsidian-nvim

Seems to be better than the last time I tried it.

home/neovim.nix

@@ -580,6 +580,24 @@ in
           autocmd QuitPre * silent! :Vista!
         '';
       }
+      {
+        plugin = obsidian-nvim;
+        type = "lua";
+        config = /* lua */ ''
+        require('obsidian').setup {
+          workspaces = {
+            {
+              name = "ドキュメント",
+              path = "~/ドキュメント",
+            },
+          },
+          disable_frontmatter = true,
+          ui = {
+            enable = false
+          }
+        }
+        '';
+      }
       fzf-vim
       vim-caddyfile
       vim-graphql