Update docs for new java client, and other changes.

Remove wrong scrape_timeout from getting started examples

Scrape timeout can't be higher than scrape interval, so this config is
just wrong. This change remove all mentions of the timeout, we chose a
reasonable default, if a user has different needs they can find it in
the configuration docs.

Remove misleading hints about multiple evaluation_interval

There is only one global evaluation_interval at this time, so a "by
default" is misleading as it can't be overwritten anywhere.

Add Varnish exporter to 3rd party section

Update anomaly blog post for new AM and alert syntax

small typo on configuration page

Add video from my FOSDEM talk to the media page

Host DreamHack blog post images from repo.

Added IoT Edison exporter

exporters.md: Add openweathermap_exporter

Recommend Grafana over PromDash.

exporters.md: Add speedtest_exporter

Add more company logos

- DigitalOcean
- Docker
- GiantSwarm
- Jodel
- Quobyte
- Weave

Fix broken console link in alert rules

Add Weave Flux to list of directly instrumented software

Updated the benchmark results