add dockerignore and update docs

.dockerignore

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+node_modules
+tests
+.git
+.gitignore
+README.md

README.md

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-# Facebook event scraper
+# Facebook page events scraper
-
+Now you can get JSON representation of all events hosted by a Facebook page.
-A simple facebook event scraper written with node using puppeteer.
-
-## Introduction
 
+## Disclaimer
 Please note that terms and conditions apply from Facebook and this script should
 only be used if written consent is provided by Facebook.
 
-## Dependencies for local install
+## Dependencies
 
-```sh
+```txt
 bash
-node > v10
+node >= v10
-yarn > # tested with 1.22
+yarn
+google-chrome / chromium
 ```
 
-## Usage
+NOTE: You might want to set environment variables to use an existing chrome 
-
+      install. (Voluntary)
-```sh
+``` sh
-./scrape --help
+export PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
+export PUPPETEER_EXECUTABLE_PATH=/bin/google-chrome
 ```
 
-## Examples
+## Usage
-
 ```sh
 ./scrape PlanetRammstein
 ./scrape --skip-upcoming-events --past-events PlanetRammstein
 ```
 
-### Alpine docker image is provided
+### Usage with docker
-
 ```sh
-rm -rf node_modules # If switching from a local install
+docker build --tag facebook-page-events-scraper .
-docker build --tag facebook-scraper .
 docker run \
     --rm \
     --cap-add SYS_ADMIN \
-    facebook-scraper \
+    facebook-page-events-scraper \
     scrape PlanetRammstein
 ```