[Feature]: Don't repeat [[file links]] even if it is present outside the code/comment block of the Index file

## Appreciation
* Great plugin brother, you have made indexing of notes extremely easy

## Current
* The plugin only updates [[file links]] inside the code/comment block of the Index file but don't track the links outside the block in that Index file

## Demand
* [Feature]: Don't repeat [[file links]] even if it is present outside the code/comment block of the Index file

## Use case
* The plugin would be used to track the [[file links]] inside a particular folder
* Outside the ``%% Zoottelkeeper: Beginning of the autogenerated index file list %%`` block one can customize his/her Index file
* Hence tracking/[[#Demand]] becomes important as to ensure duplication of links in the Index file is prevented

Start by locating the code that updates file links inside the autogenerated Index file block, then inspect how the Index file is read. The change is done when links already present outside the autogenerated block are not duplicated while the generated index remains correct.

由索引模型根据 Issue 内容生成。