add jathan's and my DebConf20 presentations

- title: Reproducing Bullseye in practice

  presented_by: Holger Levsen

  event:

    url: https://debconf20.debconf.org/talks/49-reproducing-bullseye-in-practice/

    name: DebConf20

    date: 2020-8-27

    location: online

  video:

    url: https://meetings-archive.debian.net/pub/debian-meetings/2020/DebConf20/49-reproducing-bullseye-in-practice.webm

  slides: https://reproducible-builds.org/_lfs/presentations/2020-08-27-Reproducing-bullseye-in-practice/

- title: Construcciones reproducibles en Debian (Debian Reproducible Builds): Un camino verificable desde el origen hasta el binario

  presented_by: Jonathan Bustillos

  event:

    url: https://debconf20.debconf.org/talks/81-construcciones-reproducibles-en-debian-debian-reproducible-builds-un-camino-verificable-desde-el-origen-hasta-el-binario/

    name: DebConf20

    date: 2020-8-24

    location: online

  video:

    url: https://meetings-archive.debian.net/pub/debian-meetings/2020/DebConf20/81-construcciones-reproducibles-en-debian-debian-reproducible-builds-un-camino-verificable-desde-el-origen-hasta-el-binario.webm

- title: Reproducible Toolchains For the Win!

  presented_by: Vagrant Cascadian

  event: