[Improvement] TOC node should focus relevant header on click

[Akv2021]

If the Table of Contents is present in markdown, then it'll also show up as nodes.
On clicking any content in table of contents that header should be accessible i.e.

• From below sample file, On clicking "Para 1" in markmap, it should

1. either open the md file with that section in focus (same as clicking on "Para 1" in TOC inside Markdown file.) OR
2. Focus on "Para 1" node in Markmap. [Preferred since we are navigating in same file/view]

• Currently it tries to open a file named #para-1 in the same directory. Which results in a "file not found" view.

Sample file

# Main Header
## Sub Header 1
### Para 1
- This is my content


## Sub Header 2
1. There's more content.

# Main Header 2
- line 1
- line 2

It'll have the following TOC

- [Main Header](#main-header)
  - [Sub Header 1](#sub-header-1)
    - [Para 1](#para-1)
  - [Sub Header 2](#sub-header-2)
- [Main Header 2](#main-header-2)

And Following MarkMap

[Giessen]

is this issue resolved?

[Akv2021]

@gera2ld Please let me know if you have any questions or need clarification.