Calculate offsets given ground truth masks (#19)

* Bump version 

Calculate offsets given ground truth masks

* add dark mode for docs page

* add offset calculation

* add BaseBx method to calculate offsets

* Supports np.floating and tuple, bug fixes. Resize if image_arr & image_sz is passed together to VisBx.

* Revert "Supports np.floating and tuple, bug fixes. Resize if image_arr & image_sz is passed together to VisBx."

This reverts commit 0d8cf47.

* get_gt_offsets() method that can calculate normalized offsets (ground truth should be a `BX_TYPE`)

* test_yolo update to round(4)

* get_gt_offsets() method that can calculate normalized offsets

* get_gt_offsets() fix imports

* add docs and update readme

_proc/_docs/excepts.html → _docs/excepts.html

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@@ -175,7 +180,7 @@ <h1 class="title d-none d-lg-block">Exceptions</h1>
 
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