#325 Add SBE docs and example + some other doc/website improvements.

• Explain synthesis-based engineering and its benefits in CIF documentation.
• Add FIFO synthesis example to CIF examples.
• Cross-reference with various parts of the documentation.
• Some other small improvements to the CIF documentation.
• Some improvements to text on the ESCET/CIF websites.
• Fixed a typo in the ESCET general toolkit documentation.
• Fixed CIF documentation image build script.

Closes #325 (closed)