New Tutorial: Introduction to libp2p (#574)

* wip: add "Introduction to libp2p" tutorial

* wip: add more libp2p implementations and more libp2p use cases

* upd: use P2P as peer-to-peer abreviation

* upd: updates from teri's review

* Update src/tutorials/0008-introduction-to-libp2p/01.md

Co-authored-by: Vasco Santos <vasco.santos@ua.pt>

* Update src/tutorials/0008-introduction-to-libp2p/03.md

Co-authored-by: Vasco Santos <vasco.santos@ua.pt>

* Update src/tutorials/0008-introduction-to-libp2p/05.md

Co-authored-by: Vasco Santos <vasco.santos@ua.pt>

* wip: review updates

* fix: compress svg's

* fix: compress all images

* upd: add more resources (vasco's suggestion)

* upd: add multiple choice quiz to lesson 5

* upd: add libp2p version number used in this tutorial

* upd: add ref to the fact that browsers do not support TCP

* upd: added reference to the mandatory modules

* upd: mention service types

* upd: add definitions for peer and peer-to-peer

* fix: bump new tut id to 9

* fix: remove all bundle references and use configuration instead

* fix: update test snapshots

* fix: use libp2p.create instead of class old extends libp2p class

* upd: remove implementation refs to avoid future website changes

* upd: simplify QUIC mention

* upd: mention ipfs role in libp2p creation

* upd: mention data privacy

* upd: add example of a scenario of decentralized systems

* upd: remove reference to multiplexing to avoid mentioning complex concepts

* fix: add original image and ref xkcd original post

* upd: improve start of lesson 2

* upd: add go code examples to resources

* feature on homepage, reorder tutorial listing

* update tutorial description & resource listing

* fix casing issues

* upd: improve example to avoid linking to non-existing content

* fix: links to proto school pages should be absolute.

* copy edits to lessons 1 & 2

* fix links and remove  from IPFS & libp2p

* copy edits to lessons 3-6

* Update src/tutorials/0009-introduction-to-libp2p/01.md

Co-authored-by: Zé Bateira <jose.bateira@protonmail.com>

* Update src/tutorials/0009-introduction-to-libp2p/03.js

Co-authored-by: Zé Bateira <jose.bateira@protonmail.com>

* fix: images stretched on safari

* Apply suggestions from code review

Co-authored-by: Yusef Napora <yusef@napora.org>

* update social tiles

* update courses and resources

* give use case examples

* update publication date

Co-authored-by: Ze Bateira <jlageb@gmail.com>
Co-authored-by: Vasco Santos <vasco.santos@ua.pt>
Co-authored-by: terichadbourne <terichad@gmail.com>
Co-authored-by: Teri Chadbourne <terichadbourne@users.noreply.github.com>
Co-authored-by: Yusef Napora <yusef@napora.org>

Author: 4 people