Fix broken links

.../07/15/klimatizalas-a-rack-helyisegekben-elso-felvonas.md

app/news/2012/07/15/rack-szereles-a-2-emeleten.md

app/news/2012/07/23/halozati-kimaradas-a-16-18-emeleten.md

app/news/2012/07/24/a-halozatfejlesztes-haladasa.md

app/news/2012/07/26/forendezo-szerelese.md

app/news/2012/08/28/halofelujitas.md

app/news/2015/08/05/rack-szereles-a-8-szinten.md

app/news/2015/08/05/villanyszerelesi-munkalatok-a-hazban.md

app/news/2017/09/16/salgopalyazat-2017-osz.md

app/news/2018/02/12/salgopalyazat-2018-tavasz.md

app/news/2018/08/30/salgopalyazat-2018-osz.md

app/news/2019/03/30/salgopalyazat-2019-tavasz.md

app/news/2020/01/09/megujithatok-az-eset-licenszek.md

app/news/2020/03/05/salgopalyazat-2020-tavasz.md

app/news/2021/02/26/salgopalyazat-2021-tavasz.md

app/static/documents/salgo_cimke.pdf