https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-cli-command-reference-sam-build.html

* Remove conflicting gitignore lines, add reference

Ref (introduction of a new "public" folder in Next.js):
https://nextjs.org/blog/next-9-1#public-directory-support

* Improve solution to conflicting files

There are a number of OpenSSL-related file extensions (e.g., .pem, .crt,
etc..) that contain data that are generally best not committed to
repositories.  This file contains several common file extensions that
often correlate to these types of files.

* Add esp-idf.gitignore

From https://github.com/espressif/esp-idf-template/blob/master/.gitignore

* Add header comments to esp-idf.gitignore

Added a new .gitignore for Atmel Studio.
https://www.microchip.com/mplab/avr-support/atmel-studio-7

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