[gh-pages] add 'reports' sub-section with initial performance measurements

[lukaszstolarczuk]

Preview:
https://lukaszstolarczuk.github.io/pmemkv/#performance-reports

// the external storage space is just too long waiting time, so for now we publish this one into GH; later on, we move on to the new storage place (I hope 😸 )

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This change is 

[karczex]

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reports/index.md, line 1 at r2 (raw file):

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Is reports directory really needed? Probably you may just add perdormace_reports.md to main directory. Or even add section to README.md.

[KFilipek]

Reviewed 3 of 3 files at r1, 2 of 2 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @lukaszstolarczuk)

[lukaszstolarczuk]

Reviewable status: 1 of 3 files reviewed, 1 unresolved discussion (waiting on @karczex and @KFilipek)

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reports/index.md, line 1 at r2 (raw file):

Previously, karczex (Paweł Karczewski) wrote…

Is reports directory really needed? Probably you may just add perdormace_reports.md to main directory. Or even add section to README.md.

hah, good catch. Dir is not needed, but I think we may have this list of reports (perhaps not only performance ones) quite long, someday... so the separate reports.md seems like a good idea.

[karczex]

Reviewable status: 1 of 3 files reviewed, all discussions resolved (waiting on @KFilipek)

[igchor]

Reviewable status: 1 of 3 files reviewed, all discussions resolved (waiting on @KFilipek)