changed .gitignore to include rendered files

.gitignore

_book/Introduction-to-Quantum-Computing.pdf

_book/index.html

_book/intro.html

_book/quantumBasics.html

_book/search.json

_book/site_libs/bootstrap/bootstrap-icons.css

_book/site_libs/bootstrap/bootstrap-icons.woff

_book/site_libs/bootstrap/bootstrap.min.css

_book/site_libs/bootstrap/bootstrap.min.js

_book/site_libs/clipboard/clipboard.min.js

_book/site_libs/quarto-html/anchor.min.js

_book/site_libs/quarto-html/popper.min.js

_book/site_libs/quarto-html/quarto-syntax-highlighting.css

_book/site_libs/quarto-html/quarto.js

_book/site_libs/quarto-html/tippy.css

_book/site_libs/quarto-html/tippy.umd.min.js

_book/site_libs/quarto-nav/headroom.min.js

_book/site_libs/quarto-nav/quarto-nav.js

_book/site_libs/quarto-search/autocomplete.umd.js