As of today (version 10.1.0), none of the supported mermaid diagrams have an exact match to what you have asked for, the closest is the flowchart
.
The main differences from your drawing are that in mermaid you cannot change the style of the arrowhead (size or color) or manipulate the distance from the nodes.
But you can get something similar to what you asked for:
I have tested the following codeblock in GitHub Markdown:
```mermaid
%%{init: {"flowchart": {"curve": "linear"}, "themeVariables": {"edgeLabelBackground": "transparent"}}}%%
flowchart LR
wd(\n\n\nworking\ndirectory\n\n\n )
sa(staging\narea)
lg(\nlocal\n.git\n )
rg("\n\n\nremote\n[github]\n\n\n ")
lg -->|checkout| wd
wd -->|add| sa
sa -->|commit| lg
lg -->|push| rg
rg -->|fetch| lg
rg --->|pull| wd
%% Styles
style wd fill:#fff,stroke:#000
style sa fill:#d9ead3,stroke:#000
style lg fill:#93c47d,stroke:#000
style rg fill:#eee,stroke:#000
linkStyle 0 stroke:#f4cccc,stroke-width:10px %% Arrow checkout
linkStyle 1 stroke:#cfe2f3,stroke-width:10px %% Arrow add
linkStyle 2 stroke:#6fa8dc,stroke-width:10px %% Arrow commit
linkStyle 3 stroke:#0b5394,stroke-width:10px %% Arrow push
linkStyle 4 stroke:#e6b8af,stroke-width:10px %% Arrow fetch
linkStyle 5 stroke:#dd7e6b,stroke-width:10px %% Arrow pull
```
This results in the following output:
And at mermaid live editor it looks like this: