update: remove bless-crawl browser-runtime specific module

[zees-dev]

Description

This pull request removes support for the crawl feature across the codebase, updates dependencies, and adjusts related documentation and configurations accordingly.
The most significant changes include the removal of the BlessCrawl plugin implementation, updates to the Cargo.toml file to exclude the crawl feature, and modifications to the README.md to reflect the removal of BlessCrawl.

Updated blockless-sdk v0.2.2 -> v0.2.3

Removal of crawl feature:

• .github/workflows/release.yml: Removed crawl and browser build configurations from the matrix.
• src/crawl/mod.rs: Removed the entire implementation of the BlessCrawl plugin, including methods for scraping, mapping, and crawling web pages.
• src/lib.rs: Removed references to the crawl module and its bindings from the runtime initialization logic. [1] [2] [3] [4]
• examples/crawl.js: Deleted the example file demonstrating usage of the BlessCrawl plugin.
• src/crawl/crawl.js: Removed the JavaScript wrapper for the BlessCrawl plugin.

Updates to dependencies and features:

• Cargo.toml: Updated the blockless-sdk dependency to version 0.2.3 and removed the crawl feature from the default feature set. [1] [2]

Documentation updates:

• README.md: Removed references to BlessCrawl from the list of plugins, architecture diagrams, and example commands. Updated example commands to use BlessFetch instead. [1] [2] [3] [4] [5]