Update installation instructions in README

Update patch version - highlighting fix

Ensure highlighting regex is not greedy, which breaks multiple highlights in a document

Ensure test modification for metadata section calls the correct transformer function for highlight rewriting

Prepare for version 0.2.0

Add pyproject.toml file

Use rewriting engine for rewriting highlights in post content

Import rewriting engine by default in the rewriting package

Implement rewriting engine to process content blocks

Implement Obsidian highlighting transformation

Add test case for highlighting multiline text which Obsidian seems to do

Add tests for highlight transformation

Move rewriting module into its own package for a clearer transformers location

Fix edge cases in parsing preformatted blocks

Add tests covering edge scenarios with preformatted blocks