Migrate specs to individual repos

[rootulp]

Context

• EPIC: Add an official spec for the app celestia-app#650

Candidates Repos

It may aid discoverability if these specs are migrated to a consistent location across repos (i.e. specs/)

• https://github.com/celestiaorg/celestia-core
• https://github.com/celestiaorg/celestia-app
• https://github.com/celestiaorg/celestia-node
• https://github.com/celestiaorg/docs
• https://github.com/celestiaorg/celestia.org

Cursory Breakdown

Page	Repo	Notes
architecture.md	docs or celestia.org
block_proposer.md	celestia-app
consensus.md	celestia-core
data_structures.md	celestia-app or celestia-core
light_client.md		empty so removable
networking.md	celestia-app or celestia-core
node_types.md	celestia-node
specification.md		table of contents so removable
distributing_rewards.md	celestia-core
fork_choice_das.md	docs or celestia.org
message_block_layout.md	celestia-app
rationale.md		table of contents so removable
rewards.md	celestia-core

[rootulp]

One downside to this migration is that pages will be split across repos so existing relative links must be converted to absolute links to avoid breakage. Example the relative link ./consensus.md on this line will be invalid after this migration and should likely be replaced with the absolute link https://github.com/celestiaorg/celestia-core/tree/v0.34.x-celestia/specs/consensus.md

[rootulp]

After migration, we should use the Transfer issue feature to migrate issues to the relevant repo. @liamsi can you please give me write access on this repo in order to do this?

[rootulp]

Blocked on celestiaorg/celestia-app#730

[adlerjohn]

can you please give me write access on this repo in order to do this?

done