docs(plugins): add reference to elysia-htmx

Author: gtramontina

docs/plugins/overview.md

@@ -59,6 +59,7 @@ That's why Elysia is creating pre-built common pattern plugin for convinient usa
 - [Basic Auth](https://github.com/eelkevdbos/elysia-basic-auth) - Basic http authentication for Elysia (using 'request' event).
 - [i18n](https://github.com/eelkevdbos/elysia-i18next) - i18n wrapper for Elysia based on i18next
 - [Elysia Request ID](https://github.com/gtramontina/elysia-requestid) - Adds/Forwards request IDs (`X-Request-ID` or custom).
+- [Elysia HTMX](https://github.com/gtramontina/elysia-htmx) - Context helpers for [HTMX](https://htmx.org/).
 
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 If you have plugin written for Elysia, feels free to share you plugin by creating PR to [documentation repo](https://github.com/elysiajs/documentation).