docs: move SolidStart v1 docs under /v1 (#1618)

* docs: move SolidStart v1 docs under /v1

* docs: clarify SST supports SolidStart v1

* docs: default SolidStart routes to v2

* fix(osmium): sidebar text alignment

* ci: apply automated fixes

* docs: mark SolidStart v1 as legacy

* fix: rename fn

* chore: bump SolidBase to 0.6.13

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Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
Co-authored-by: jer3m01 <jer3m01@jer3m01.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>