Refactor file and URL paths in docusaurus (#11080)

* Fix introduction link

* Restore staking guide pages

* Remove Edit this page link

* Fix broken wallet guide link

* Restore lost images

* Fixup URL paths to match gitbook style

* Refactor wallet guide READMEs and clean up URLs

* Remove lingering gitbook files

* Refactor all README files to keep consistent linking

* Updte homepage tile links

Co-authored-by: publish-docs.sh <maintainers@solana.com>

docs/build.sh

@@ -6,15 +6,6 @@ source ../ci/env.sh
 
 cd "$(dirname "$0")"
 
-# md check
-find src -name '*.md' -a \! -name SUMMARY.md |
- while read -r file; do
-   if ! grep -q '('"${file#src/}"')' src/SUMMARY.md; then
-       echo "Error: $file missing from SUMMARY.md"
-       exit 1
-   fi
- done
-
 : "${rust_stable_docker_image:=}" # Pacify shellcheck
 
 # shellcheck source=ci/rust-version.sh