Docs: Updated Grafana OSS Introduction (#66004)
* Added Phlare and added static data sources to intro instead of it just being TSDB sources
* Update docs/sources/introduction/_index.md
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
* Update docs/sources/introduction/_index.md
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
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Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
(cherry picked from commit e8813916c9)
Co-authored-by: Alex Close <alex.kirtley-close@grafana.com>