How to setup HDF5 plugin

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• close doc: HDF5 files named by EPICS PV #652

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pandoc is not found, still

2022-07-06T06:16:01.8933450Z Notebook error:
2022-07-06T06:16:01.8933818Z PandocMissing in examples/_excel_scan.ipynb:
2022-07-06T06:16:01.8934448Z Pandoc wasn't found.
2022-07-06T06:16:01.8934715Z Please check that pandoc is installed:
2022-07-06T06:16:01.8935050Z https://pandoc.org/installing.html
2022-07-06T06:16:02.3884772Z Error: Invalid status code: 2
2022-07-06T06:16:02.3885643Z     at ChildProcess.<anonymous> (/home/runner/work/_actions/sphinx-notes/pages/master/main.js:9:19)
2022-07-06T06:16:02.3886071Z     at ChildProcess.emit (events.js:314:20)
2022-07-06T06:16:02.3886398Z     at maybeClose (internal/child_process.js:1022:16)
2022-07-06T06:16:02.3886816Z     at Process.ChildProcess._handle.onexit (internal/child_process.js:287:5) {
2022-07-06T06:16:02.3887148Z   code: 2
2022-07-06T06:16:02.3887334Z }
2022-07-06T06:16:02.3887559Z Error: Invalid status code: 2
2022-07-06T06:16:02.3888088Z     at ChildProcess.<anonymous> (/home/runner/work/_actions/sphinx-notes/pages/master/main.js:9:19)
2022-07-06T06:16:02.3888481Z     at ChildProcess.emit (events.js:314:20)
2022-07-06T06:16:02.3888817Z     at maybeClose (internal/child_process.js:1022:16)
2022-07-06T06:16:02.3889218Z     at Process.ChildProcess._handle.onexit (internal/child_process.js:287:5)
2022-07-06T06:16:02.4077142Z Post job cleanup.

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pandoc cannot be installed by pip, use sudo apt install pandoc (that works)

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GH Actions workflow successful again now

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Unit tests are failing in a set of tests unrelated to this PR. Yet, those tests are not rock-solid reliable. Should be a separate issue.