feat: add "Open in Readwise" link

[natterstefan]

Feature

Inspired by TfTHacker's obsidian-readwise-inbox schema, it'd be beneficial having a link to the Readwise highlight URL and ID ready at your fingertips.

Example

- {{ highlight_text }}{% if highlight_tags %} 
    - Tagged:{% for tag in highlight_tags %} #{{tag|replace(" ","-")}}{% endfor %}{% endif %}
    - {% if highlight_location and highlight_location_url %}[{{highlight_location}}]({{highlight_location_url}}), {% elif highlight_location %} {{highlight_location}}, {% endif %}[Open in Readwise](https://readwise.io/open/{{highlight_id}}){% if highlight_note %}
    - Note: {{ highlight_note }}{% endif %}
^rw{{highlight_id}}

- A sample highlight 
    - Tagged: #sample-tag #funny
    - [Page 2](https://readwise.io/), [Open in Readwise](https://readwise.io/open/1234)
^rw1234

Ressources

• https://github.com/TfTHacker/obsidian-readwise-inbox#export-formatting-requirements
• Using Readwise’s highlight_id as a single source of truth in Obsidian | by TfTHacker | Medium