Include "/" in empty paths

When articles were in the base directory, the string replacement:
`str(full_path).replace(str(base_path) + '/'`
would not match, causing the whole absolute path to be included which
would break the link.

This should now work if the article is in the base directory or in any
subfolder.

pelican/plugins/obsidian/obsidian.py

@@ -49,7 +49,7 @@ class ObsidianMarkdownReader(MarkdownReader):
             filename, linkname = get_file_and_linkname(match)
             path = ARTICLE_PATHS.get(filename)
             if path:
-                link_structure = '[{linkname}]({{filename}}/{path}/{filename}.md)'.format(
+                link_structure = '[{linkname}]({{filename}}{path}{filename}.md)'.format(
                     linkname=linkname, path=path, filename=filename
                 )
             else:
@@ -60,7 +60,7 @@ class ObsidianMarkdownReader(MarkdownReader):
             filename, linkname = get_file_and_linkname(match)
             path = FILE_PATHS.get(filename)
             if path:
-                link_structure = '![{linkname}]({{static}}/{path}/{filename})'.format(
+                link_structure = '![{linkname}]({{static}}{path}{filename})'.format(
                     linkname=linkname, path=path, filename=filename
                 )
             else:
@@ -101,7 +101,7 @@ def populate_files_and_articles(article_generator):
     for article in articles:
         full_path, filename_w_ext = os.path.split(article)
         filename, ext = os.path.splitext(filename_w_ext)
-        path = str(full_path).replace(str(base_path) + '/', '')
+        path = str(full_path).replace(str(base_path), '') + '/'
         ARTICLE_PATHS[filename] = path
 
     globs = [base_path.glob('**/*.{}'.format(ext)) for ext in ['png', 'jpg', 'svg', 'apkg', 'gif']]
@@ -109,7 +109,7 @@ def populate_files_and_articles(article_generator):
 
     for _file in files:
         full_path, filename_w_ext = os.path.split(_file)
-        path = str(full_path).replace(str(base_path) + '/', '')
+        path = str(full_path).replace(str(base_path), '') + '/'
         FILE_PATHS[filename_w_ext] = path