ci: auto-deploy sandbox to github pages
feat: add wasm-based djoc sandbox
feat: support `add_title` on html output
feat: add standalone toggle to latex rendering
feat: add `add_title` setter
feat: add standalone option to html builder
build: add feature toggles
fix: link definitions
feat: add subcaption as default package
fix: en dash and em dash
chore: bump to jotdown 0.3.0
docs: update README
fix: skip non-parsable manifests
refactor: default build_dir value is None
feat: add `add-title` field to builder manifest
refactor!: move locale to builder config
fix: improve compile command
test: document removal of doctest for write_pdf
fix: tests for use in Nix shell
fix: properly filter source for Nix