docs: try dpdata online

[codecov[bot]]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (57c5004) 82.96% compared to head (b5a2d96) 82.86%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #552 +/- ## ========================================== - Coverage 82.96% 82.86% -0.11% ========================================== Files 73 73 Lines 6510 6523 +13 ========================================== + Hits 5401 5405 +4 - Misses 1109 1118 +9 ``` | [Files](https://app.codecov.io/gh/deepmodeling/dpdata/pull/552?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling) | Coverage Δ | | |---|---|---| | [dpdata/deepmd/hdf5.py](https://app.codecov.io/gh/deepmodeling/dpdata/pull/552?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBkYXRhL2RlZXBtZC9oZGY1LnB5) | `81.55% <60.00%> (-1.45%)` | :arrow_down: | | [dpdata/plugins/deepmd.py](https://app.codecov.io/gh/deepmodeling/dpdata/pull/552?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBkYXRhL3BsdWdpbnMvZGVlcG1kLnB5) | `65.62% <60.00%> (-0.78%)` | :arrow_down: | | [dpdata/\_\_init\_\_.py](https://app.codecov.io/gh/deepmodeling/dpdata/pull/552?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBkYXRhL19faW5pdF9fLnB5) | `57.14% <28.57%> (-14.29%)` | :arrow_down: |

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