Add serial config

[danielcharrua]

On restart if GPIO is touched the device will enter on "serial config mode".
Also added a .gitignore to work more comfortable with vscode and Mac when pushing changes.

[AxelHamburch]

I have tested it, it works. Pin 4 to activate the "Launch portal" or now "Launch serial config" was the missing access.

[AxelHamburch]

It does not work, you have to choose another variant.

[danielcharrua]

@AxelHamburch can you explain? This PR adds an old feature that was deprecated (I think @arcbtc explained why in the telegram group). When I touch pin 4 the device enters in serial config mode, but this has nothing to do with the browser serial.

If this PR is not addressing the issue you can discard it, no worries!

[arcbtc]

I deleted this code, because it does nothing, only get in the way of using gpio4

[danielcharrua]

@arcbtc how do you load the json config if not enabling the serial config mode on the device? We were talking these past days on Telegram but nobody answered that 🫠

[arcbtc]

I'd like @motorina0 to take a look, as I think the fix is the memory gets wiped before uploading new config. As far as I am aware this code is redundant.

[motorina0]

@danielcharrua I need a bit of help here. Can you please specify:

Summary

• what the problem was

Steps:

1. start the device...
2. ....

Actual Result:

• ...

Expected Result:

• ... (what this fix does)