Add resizing to contributing

Add PFSense and VyOS router distribution logos

Support Apache Beam

This PR adds information on how to resize your images when
contributing.

It also applies a few formatting changes such as:

- Using named links to reduce clutter
- Folding the text at 80 characters for command line users
- Removing dollar signs in codeblocks if no command output is provided
  [MD014][md014]

[md014]: https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md#md014---dollar-signs-used-before-commands-without-showing-output

Update CONTRIBUTING.md

Fix typo

* Initial commit

* feat(gcp): add identity-aware proxy

Co-authored-by: McSly <sylvain.mielot@gmail.com>

feat(security): add Trivy

* Edges support

* Documentation and additional style attribute

* Better example and review changes

* Fix xlabel

* Fix docs

* Add Edge default properties

* Fix edge docs

Co-authored-by: Andrew Selivanov <a_selivanov@wargaming.net>

feat(aws - customer engagement): added Customer Engagement services

Included Amazon Connect, Amazon Pinpoint and Amazon Simple Email Service (SES)

Add more nodes for aws/onprem

Created new resource type under onprem called client

Add todos badge to README

Closes #49

* Apply minor grammar changes to README

* Minor grammar change in text for website

* Updated OCI icons to Redwood Bark

* Correct icon

Add `choco install graphviz` tip for Windows users