added a new edition of the Security for Dummies event

See merge request !31

3 commits

See merge request !29

Changed link to Element to a generalized Matrix link

See merge request !30

Pointer to contact page is already present
in route description page "enter".

The additional pointer is at the bottom of `enter.md`
as a "catch all exception handler".
It has also its own header.

So that line is now like
all the other header lines.

IRC network switch

See merge request !27

Where to enter the maze.

See merge request !28

The new network is Libera,  https://libera.chat