fix: graph_attr example

`graphviz` only support string or byte-like objects as value in attributes. The example was passing `fontsize` as `int` that throws `TypeError`.

Just fixing the example

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