Fix/qis (#56)

* rename hipposync.md to index.md

Signed-off-by: Charlie Yi <charlie.yi@memverge.com>

* add hyperlinks to mentions of memmachine, change diagram.png to use a white background instead of clear

Signed-off-by: Charlie Yi <charlie.yi@memverge.com>

* remove links to memmachine.ai, crop image

Signed-off-by: Charlie Yi <charlie.yi@memverge.com>

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Signed-off-by: Charlie Yi <charlie.yi@memverge.com>

Author: Charlie-Yi-2002