feat: add GitHub flavored markdown syntax [joplin-search-integration]

[jannikgohr]

Add support for some GitHub flavored Markdown syntax, which is also supported in Joplin by default

New Syntax supports:

• autolink literals
• footnotes
• strikethrough
• tables
• tasklists

Examples:

autolink literals

Links become clickable by default even when not marked as link in Markdown

Rendered:
https://example.com
Markdown:
https://example.com

footnotes

Rendered:
Here's a sentence with a footnote. ¹

Here's a sentence with a footnote. [^1]

[^1]: This is the footnote.

strikethrough

Rendered:
strikethrough
Markdown:
~~strikethrough~~

tables

Rendered:

Syntax	Description
Header	Title
Paragraph	Text
Markdown:

| Syntax | Description |
| ----------- | ----------- |
| Header | Title |
| Paragraph | Text |

tasklists

Rendered (but not interactive in Joplin-search-integration):

• Write the press release
• Update the website
• Contact the media

Markdown:

- [x] Write the press release
- [ ] Update the website
- [ ] Contact the media

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With this we should support most of Joplin's Markdown syntax

Footnotes

1. This is the footnote.
   Markdown: ↩

[rxliuli]

Released https://github.com/rxliuli/joplin-utils/releases/tag/joplin-search-integration%400.10.3

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Sorry, I am traveling, so my response is slower.

[jannikgohr]

No problem, thanks for the great work!