Duplicated files that only differ by case creates problems in macOS / case-insensitive filesystems

[davinotdavid]

Cloning this repo into a macOS / Windows installation creates some warnings for files that have the same name and only differ by casing.

This can be quite confusing for users as git shows the duplicated files as modified ones.

Case-duplicate pairs (11, byte-identical — extension case only)
.gitbook/assets/cloud.png            (dup of cloud.PNG)
.gitbook/assets/composeaction.png    (dup of composeAction.png)
.gitbook/assets/folder_pane.png      (dup of folder_pane.PNG)
.gitbook/assets/link.png             (dup of link.PNG)
.gitbook/assets/message_list.png     (dup of message_list.PNG)
.gitbook/assets/page.png             (dup of page.PNG)
.gitbook/assets/selection.png        (dup of selection.PNG)
.gitbook/assets/tab.png              (dup of tab.PNG)
.gitbook/assets/options.png          (dup of options.PNG)

Fully orphaned (referenced by no doc, either case)
.gitbook/assets/options (1).PNG
.gitbook/assets/options (1).png
.gitbook/assets/screen3.PNG
.gitbook/assets/screen3.png

browserAction group (3 orphaned; content is cross-scrambled with the referenced file, not clean duplicates)
.gitbook/assets/browserAction.png     (unreferenced; content == browseraction (1).png)
.gitbook/assets/browseraction.png     (unreferenced; content == browserAction (1).png)
.gitbook/assets/browseraction (1).png (unreferenced; content == browserAction.png)