Convert shortcuts image into markdown

doc/workflow/shortcuts.md

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 You can see GitLab's keyboard shortcuts by using 'shift + ?'
 
-![Shortcuts](shortcuts.png)
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+## Global Shortcuts
+
+| Keyboard Shortcut | Description |
+| ----------------- | ----------- |
+| <kbd>s</kbd> | Focus search |
+| <kbd>?</kbd> | Show/hide this dialog |
+| <kbd>⌘</kbd> + <kbd>shift</kbd> + <kbd>p</kbd> | Toggle markdown preview |
+| <kbd>↑</kbd> | Edit last comment (when focused on an empty textarea) |
+
+## Project Files Browsing
+
+| Keyboard Shortcut | Description |
+| ----------------- | ----------- |
+| <kbd>↑</kbd> | Move selection up |
+| <kbd>↓</kbd> | Move selection down |
+| <kbd>enter</kbd> | Open selection |
+
+## Finding Project File
+
+| Keyboard Shortcut | Description |
+| ----------------- | ----------- |
+| <kbd>↑</kbd> | Move selection up |
+| <kbd>↓</kbd> | Move selection down |
+| <kbd>enter</kbd> | Open selection |
+| <kbd>esc</kbd> | Go back |
+
+## Global Dashboard
+
+| Keyboard Shortcut | Description |
+| ----------------- | ----------- |
+| <kbd>g</kbd> + <kbd>a</kbd> | Go to the activity feed |
+| <kbd>g</kbd> + <kbd>p</kbd> | Go to projects |
+| <kbd>g</kbd> + <kbd>i</kbd> | Go to issues |
+| <kbd>g</kbd> + <kbd>m</kbd> | Go to merge requests |
+
+## Project
+
+| Keyboard Shortcut | Description |
+| ----------------- | ----------- |
+| <kbd>g</kbd> + <kbd>p</kbd> | Go to the project's home page |
+| <kbd>g</kbd> + <kbd>e</kbd> | Go to the project's activity feed |
+| <kbd>g</kbd> + <kbd>f</kbd> | Go to files |
+| <kbd>g</kbd> + <kbd>c</kbd> | Go to commits |
+| <kbd>g</kbd> + <kbd>b</kbd> | Go to builds |
+| <kbd>g</kbd> + <kbd>n</kbd> | Go to network graph |
+| <kbd>g</kbd> + <kbd>g</kbd> | Go to graphs |
+| <kbd>g</kbd> + <kbd>i</kbd> | Go to issues |
+| <kbd>g</kbd> + <kbd>m</kbd> | Go to merge requests |
+| <kbd>g</kbd> + <kbd>s</kbd> | Go to snippets |
+| <kbd>t</kbd> | Go to finding file |
+| <kbd>i</kbd> | New issue |
+
+## Network Graph
+
+| Keyboard Shortcut | Description |
+| ----------------- | ----------- |
+| <kbd>←</kbd> or <kbd>h</kbd> | Scroll left |
+| <kbd>→</kbd> or <kbd>l</kbd> | Scroll right |
+| <kbd>↑</kbd> or <kbd>k</kbd> | Scroll up |
+| <kbd>↓</kbd> or <kbd>j</kbd> | Scroll down |
+| <kbd>shift</kbd> + <kbd>↑</kbd> or <kbd>shift</kbd> + <kbd>k</kbd> | Scroll to top |
+| <kbd>shift</kbd> + <kbd>↓</kbd> or <kbd>shift</kbd> + <kbd>j</kbd> | Scroll to bottom |
+
+## Issues and Merge Requests
+
+| Keyboard Shortcut | Description |
+| ----------------- | ----------- |
+| <kbd>a</kbd> | Change assignee |
+| <kbd>m</kbd> | Change milestone |
+| <kbd>r</kbd> | Reply (quoting selected text) |
+| <kbd>e</kbd> | Edit issue/merge request |
+| <kbd>l</kbd> | Change label |
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