[Substrate.io Migration] Glossary (#3)

* Add initial glossary

* initial cleanup

* Update polkadot-protocol/introduction/glossary.md

Co-authored-by: Radha <86818441+DrW3RK@users.noreply.github.com>

* Update polkadot-protocol/introduction/glossary.md

Co-authored-by: Radha <86818441+DrW3RK@users.noreply.github.com>

* fix links and provide updated defs

* remove and organize

* remove more stuff, improve definitions, add glossaries

* Update polkadot-protocol/introduction/glossary.md

Co-authored-by: Erin Shaben <eshaben@icloud.com>

* Update polkadot-protocol/introduction/glossary.md

Co-authored-by: Erin Shaben <eshaben@icloud.com>

* Update polkadot-protocol/introduction/glossary.md

Co-authored-by: Erin Shaben <eshaben@icloud.com>

* Apply suggestions from code review

Co-authored-by: Erin Shaben <eshaben@icloud.com>

* Addressing comments

* took care of majority of formatting

* fix vale stuff (except for some titles it is triggering)

* formatting + addressing vale

* most vale things addressed

* Apply suggestions from code review

Co-authored-by: Dawn Kelly <83190195+dawnkelly09@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Dawn Kelly <83190195+dawnkelly09@users.noreply.github.com>

* Addressed comments

* make vale a little more happy

* applies edits from review

* Apply suggestions from code review

Co-authored-by: Erin Shaben <eshaben@icloud.com>

* additional edits per review

* edits per review

* Apply suggestions from code review

Co-authored-by: Erin Shaben <eshaben@icloud.com>

---------

Co-authored-by: Radha <86818441+DrW3RK@users.noreply.github.com>
Co-authored-by: Erin Shaben <eshaben@icloud.com>
Co-authored-by: Dawn Kelly <83190195+dawnkelly09@users.noreply.github.com>
Co-authored-by: DAWN KELLY <dawnkelly09@gmail.com>

polkadot-protocol/introduction/.pages

@@ -1,4 +1,5 @@
 title: Introduction to Polkadot
 nav:
   - index.md
+  - 'Glossary': 'glossary.md'
   - parachains