Add Calva REPL connect settings

[PEZ]

Addressing:

• REPL workflow via Calva #7

I've added a Calva Custom Connect Sequence to streamline the starting of the REPL. And I then also added a Calva section in the README. Maybe it could be an editors.md file at some point...

Please note that I've also remove .vscode from .gitignore, since the settings are in this folder. (And I generally think it makes sense to keep this file in the repo.)

[sritchie]

Thank you @PEZ , this is wonderful! I'll get Calva fired up and test this out before merging, as I've been looking for an excuse to use it more heavily.

I may also take this approach and apply it to the various templates I've got like https://leva.mentat.org/#project-template that are generating deps.edn files with an alias that folks will usually want activated...

Thank you!@

[PEZ]

You are welcome, @sritchie! Make sure it is the latest Calva (2.0.364), because it contains a fix to enable the keyboard shortcut for opening a markdown-based Clerk notebook (custom commands previously only worked from Clojure files).