Fix: Conflict between backlinks and LaTeX brackets due to ripgrep command

[v3natio]

Fix for #37

I added an implementation of the treesitter helper I use for my snippets.

Essentially it just leverages the treesitter nodes to detect whether we're in math mode (where the parent node is enclosed by $ or $$), or in text mode.

Then, I modified the find_search_start function so that it won't run if we're in math mode.

The only issue now, which I need some help for, is that whenever I have inbalanced braces within mathmode, then the treesitter helper will default back to textmode, and we run back into the issue we were trying to fix. For example:

$$
\begin{flalign*}
  &\left[ d_{d \right] &&\\
\end{flalign*}
$$

This is still better than the original, as before it would return the error even when braces were balanced.

[v3natio]

Also, I decided that the best course of action would be to use treesitter, as string manipulation within the find_search_start function wouldn't be proper due to the use of display mode for math (where the $ signs are not in the same line as the math).