docs: documentation refresh for milestone

[deekerno]

Closes #566, #579.

Changelog

• Add information about contract IDs and the need to change them after editing contract
• Add information about optional schema fields
• Remove bits using --background flag with fuel-indexer run command
• Fix query example on block explorer example
• Add link to M1/M2 WASM fix to WASM dependency page
• Fix keyboard navigation issue (cannot click right after fuelup #579) by adding index pages to problem sections
• Fix terminology usage in places
• Add "Queries" page to GraphQL (I felt that it's better to have more information than less)
• Add Appendix header with Glossary section
• Edit and correct sentence structure in various places
• Replaced old Fuel logo in README with a Fuel Indexer header image (thanks @Braqzen!)

Testing Steps

0. cargo install mdbook
1. cd docs
2. mdbook serve
3. Navigate to localhost:3000 and read the book

[sarahschwartz]

Amazing, thank you! For the receipt type references it would be nice to have small examples for how those can be used in a handler function. For example, in the ReturnData receipt type, we could add something like this:

You can handle functions that produce a ReturnData receipt type by using the returned type as a function parameter like this:

fn handle_return_data(data: MyStruct) {
  // handle the returned data
}

[deekerno]

@sarahschwartz, I definitely think that's a beneficial change! If @ra0x3 agrees, then feel free to push up something that you feel works best.

[0xmovses]

Some really great additions to our docs! Particularly glossary.md and graphql/queries.md, I think users will find that very useful. Just a few suggestions.

[ra0x3]

blocked by #630