mkdnflow: adapt follow link behavior

- Sets the `perspective.priority` to `current` to get the follow link
  feature behaves as I need, relative to the current buffer.
- Fixes the new file template to avoid a blank column at the begining
  (results in an invalid YAML syntax).

Co-Authored-by: iGor milhit <igor.milhit@unige.ch>

lua/custom/plugins/mkdnflow.lua

@@ -22,6 +22,10 @@ return {
           markdown = true,
           pandoc = true
         },
+        perspective = {
+          -- Ensure that paths are relative to the current file
+          priority = "current"
+        },
         links = {
           conceal = true,
         },

spell/en.utf-8.add

@@ -8,3 +8,4 @@ InfoBiblio
 Réaménagement
 biodiversité
 hyperindustrialisés
+lacto-fermentation