[docs] Parameterize company name and url in docs

[LucilleH]

Summary

I'm unsure if this PR is necessary, given the following:

• Many links and references are within a code block. Markdown does not properly pick up the variable in such places
• Many of links are pointing to github. Changing all the links will mean almost too much React for too little gain, as it makes the markdown file less readable
• vscode extension links, discord, install script, etc needs special treatment
• images need special treatment

I'll keep this as a draft for now and see if others have thoughts.

How was it tested?

yarn start