Add Slides (Lyon) and Video (CJUG)
Add Slides (Lyon) and Video (CJUG)

(cherry picked from commit d34413c)

madvirus/kotlin-web-site,meilalina/kotlin-web-site,belovrv/kotlin-web-site,voddan/kotlin-web-site,belovrv/kotlin-web-site,meilalina/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,TeamKotl/kotlin-web-site,meilalina/kotlin-web-site,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,meilalina/kotlin-web-site,voddan/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,madvirus/kotlin-web-site,voddan/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,belovrv/kotlin-web-site,TeamKotl/kotlin-web-site,hltj/kotlin-web-site-cn,TeamKotl/kotlin-web-site,hltj/kotlin-web-site-cn,madvirus/kotlin-web-site