v0.13.0: add more location specifiers to `loc`

Features

• Include google_font() helper fn in API reference by @rich-iannone and @jrycw in (#464, #471)
• Allow for granular section restyling via convenience api by @timkpaine in #341
• Add val_fmt_image() to enable image rendering in various components by @jrycw in #451
• Allow passing a webdriver instance to save by @machow in #478

Fixes

• Resolve global locale not being respected in GT.fmt_*() functions by @jrycw in #473

Docs

• Do not document GT members inline on its reference page by @machow in #475
• Fix deprecated warning for pl.DataFrame.pivot() by @jrycw in #472
• Update docs and code to support GoogleFont in opt_table_font() and add tests by @jrycw in #470
• Fix in headers causing their css classes get printed out by @machow in #477
• Add docstrings for new location methods by @rich-iannone in #474

Full Changelog: v0.12.0...v0.13.0