README.rst: Fix timezones in details for community meeting

The weekly community meeting is aligned to the Europe/Zurich time zone.

The current time indication, "8:00 am PT, 11:00 am ET, 5:00 pm CEST",
has two issues. Contrarily to PT or ET, which are not static but switch
between standard and daylight time, CEST is fixed at UTC+02. So the
current indication is incorrect during half the year, when most Europe
switches to CET instead of CEST, and the meeting follows. Another issue
is that the USA and Europe don't switch to/from daylight times on the
same dates, and during the few weeks when they're "out of sync", it is
unclear what time zone should be the reference.

Let's make it clear that the meeting is aligned on European time.

Signed-off-by: Quentin Monnet <quentin@isovalent.com>

README.rst

@@ -267,7 +267,9 @@ Weekly Developer meeting
 ------------------------
 * The developer community is hanging out on zoom on a weekly basis to chat.
   Everybody is welcome.
-* Weekly, Wednesday, 8:00 am PT, 11:00 am ET, 5:00 pm CEST
+* Weekly, Wednesday,
+  5:00 pm `Europe/Zurich time <https://time.is/Canton_of_Zurich>`__ (CET/CEST),
+  usually equivalent to 8:00 am PT, or 11:00 am ET.
 * `Join zoom <https://zoom.us/j/596609673>`_
 
 eBPF & Cilium Office Hours livestream