Add repo link to docs

[henry2004y]

• Add remote repository link to every page in the documentation
• Fix some issues in the plot function doc

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.45%. Comparing base (b42a64b) to head (42ef217).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #154 +/- ## ======================================= Coverage 74.45% 74.45% ======================================= Files 11 11 Lines 599 599 ======================================= Hits 446 446 Misses 153 153 ```

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