fgm/htmx-demo: HTMX tutorial code based on the https://hypermedia.systems/ book. @ ch01-contacts_app

Frédéric G. MARAND f9f43ac167 All methods working, UI working.		11 月之前
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img	d6575bd3a6 Raw port of contacts.app from Python Flask to Go. First compiling version.	11 月之前
js	f9f43ac167 All methods working, UI working.	11 月之前
site.css	d6575bd3a6 Raw port of contacts.app from Python Flask to Go. First compiling version.	11 月之前