Add further suggestions in C1 Documentation

[ritvik-thesys]

1. The doc for "Getting started from scratch" does not mention anything related to adding a font for proper functionality. Without it, the C1Chat component just renders and defaults to an unintended font.
2. There is no indication at the end of the "from scratch" section as to what else is possible. For example, image integration requires tool calling setup, so maybe we can hint at that and other possible actions after the "from scratch" guide ends.