Add toggle-able sidebar button (#47)

* feat: Initial sidebar modification to support expand/collapse

* feat: add resize

* feat: add default resize

* fix: fix widths of content

* fix: Fix redoc widths

* feat: Add aria attributes

* fix: fixed issue with content width on safari

* fix: added fix to weird seam when scrollbar always is set in mac settings

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Co-authored-by: Luke Billington <l.billington@f5.com>
Co-authored-by: Lam Nguyen <la.nguyen@f5.com>