Speedtest netdata plugin

[enggnr]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Updated the netdata after_ chezmoi script to install speedtest plugin

• Other information: Relates to #45. More details about other items are available in the issue comments.

[github-actions[bot]]

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Files ignored due to filter (1)

### Ignored files * software.yml

Files not summarized due to errors (2)

### Failed to summarize * home/.chezmoiscripts/universal/run_onchange_after_57-netdata.sh.tmpl (nothing obtained from openai) * home/.chezmoiexternal.toml.tmpl (nothing obtained from openai)

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In the recent run, only the files that changed from the base of the PR and between 9ff6720e4e7d727e47a3a7de00ded001920990a1 and 4a3ab3d87e318b950a74e386a22e9d88fd5a04c9 commits were reviewed.

Files not reviewed due to errors in the recent run (2)

### Failed to review in the last run * home/.chezmoiscripts/universal/run_onchange_after_57-netdata.sh.tmpl (no response) * home/.chezmoiexternal.toml.tmpl (no response)