social media links using web4

This PR adds the web4_get method to the contract, so that when merged, there will be a website at https://devhub.near.page

You can preview it at https://devhublink.testnet.page/

Note that the preview deployment does not have access to content, so it will not be able to display proper content for preview links, which is provided by the contract. A test community "webassemblymusic" is created for the preview deployment, to demonstrate the preview links. You can test it at https://devhublink.testnet.page/community/webassemblymusic. You may also call the preview contract to create proposals and other communities to verify that social media headers are also populated with the content.

For now the first part of the part is always mapped to the page property, so that e.g. /proposals are translated to /devhub.near/widget/app?page=proposals. Also the second part translates to handle for community ( /community/webassemblymusic -> /devhub.near/widget/app?page=community&handle=webassemblymusic ), or to id for proposal /proposal/5 -> /devhub.near/widget/app?page=proposal&id=5

In addition to metadata for social media links, and SEO friendly URLs, the actual content is viewed as well. This is done using near-bos-webcomponent which is also used for playwright tests in the DevHub frontend. A PR have also been created there to support the SEO friendly URL paths created here.

The html-escape crate is added to ensure that descriptions with html tags are escaped for the generated HTML ( to avoid malicious scripts etc ).

Examples:

https://devhublink.testnet.page/community/webassemblymusic ( This community is also created in the testnet contract )
https://devhublink.testnet.page/community/chain-abstraction ( not created in the testnet contract, so metadata is missing, but the content shows )
https://devhublink.testnet.page/proposal/0 ( Also has a proposal created in the testnet contract )
https://devhublink.testnet.page/proposal/3 ( not created in the testnet contract, so metadata is missing, but the content shows )

Part of https://github.com/NEAR-DevHub/neardevhub-bos/issues/724

Summary by CodeRabbit

New Features
- Introduced a new web4 module to handle web requests, dynamically generate HTML content, and encode responses.
- Added a public function for fetching web content based on request paths, enhancing user interaction with community and proposal pages.
Documentation
- Enhanced documentation for new web request handling functionality.
Dependencies
- Added html-escape library to support HTML content generation.

Walkthrough

The update enhances web request handling in a Rust application by introducing the web4 module. This includes new types for managing web requests and responses, a handler for dynamic HTML content creation based on request paths, and the addition of the html-escape dependency for HTML processing. The web4 module is now publicly accessible with a specific function web4_get for fetching web content.

Changes

File	Changes
`Cargo.toml`	Added `html-escape` dependency version `0.2.13`.
`src/lib.rs`	Added `web4` module to public exports, imported relevant types, and included `web4_get` function.
`src/web4/handler.rs`	Introduced `handler.rs` with web request handling functionality, including `web4_get`.

🐇✨ In the code's meadow, under the bright moon, A new module blooms, none too soon. Web4 dances, with requests it plays, Crafting HTML in wondrous ways. Cheers to the coders, with each line they write, In Rust we trust, by day and night. 🌟 🐇✨

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NEAR-DevHub / neardevhub-contract