homepage: plainer wording for v12, checkpoints and the web UI

[nicolasbisurgi]

Landing page wording: it describes what OptimusPy does for the reader, not implementation details.

TM1 v12 section

• The pill under the diagram reads "Two versions, same numbers: every comparison is like for like", in place of "Both converted to bytes…".
• The MetricService point reads "Memory is read through TM1py's MetricService, the same call on v11 and v12", without presenting unit conversion as a feature.
• The point about keeping the checkpoint in TM1's file storage is removed, along with the section's "Checkpoints →" link.

Features, "Checkpoint and resume" card

• It describes what the checkpoint is for: a reorder can take a long time on a big cube and a connection can drop, so every tested order is saved as it finishes. Running the same command again picks up where it left off, including an order that was mid-reorder when it stopped.
• The example commands show continuing and starting over. --tm1-checkpoint is no longer shown.

Web UI section

• "Runs on your machine and connects to any TM1 server it can reach over the REST API", in place of "talks only to your TM1 servers".
• The report opens from the cube's Reports tab, which is the tab's current name.

The landing page builds cleanly (vite build).

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