Speakers section with data (#194)

- Speakers section
- add script to sync speakers from schedule
- update speakers
- update the speakers page

---------

Signed-off-by: Nabarun Pal <pal.nabarun95@gmail.com>
Co-authored-by: Astraxx04 <gagan200254@gmail.com>

Author: palnabarun

src/_data/menuItems.json

@@ -41,6 +41,10 @@
                 "name": "Schedule",
                 "link": "program/schedule"
             },
+            {
+                "name": "Speakers",
+                "link": "program/speakers"
+            },
             {
                 "name": "CFP Overview",
                 "link": "cfp"