chore: update readme with demo

fix: use official github mcp server with github agent

chore: remove older demo

chore: update resolution of gif

chore: convert demo to gif

chore: convert demo to mp4

chore: update demo

fix: post to mattermost via channel name in MCP

feat: add mattermost and current date time as context

chore: add supercut demo

chore: remove older docs

build: add dependencies in uv

fix: read env variables in mattermost mcp server

chore: update docs

feat: mcp tools as langchain tools for agent