Remove all Zim wiki boilerplate

In our case it happens to always be identical

zimwiki_txt_to_logseq_md.py

@@ -2,9 +2,22 @@ import os
 
 def rewrite_file(filepath):
     with open(filepath, 'r') as f:
-        contents = f.read()
+        base = filepath[:-4]
+        newfilepath = base + ".md"
+        with open(newfilepath, 'w') as w:
+            for i, line in enumerate(f):
+                if ( (i == 0 and line == "Content-Type: text/x-zim-wiki\n")
+                  or (i == 1 and line == "Wiki-Format: zim 0.26\n")
+                  or (i == 2 and line == "Creation-Date: Not found\n")
+                  or (i == 3 and line == "Modification-Date: Not found\n")
+                  or (i == 4 and line == "\n")
+                ):
+                    continue
+
+                w.write(line)
 
 
-for filepath in os.listdir():
-    if file.endswith(".txt"):
-        rewrite_file(filepath)
+
+# for filepath in os.listdir():
+#    if file.endswith(".txt"):
+#        rewrite_file(filepath)