Preserve capitalization of repository URL in links

[fregante]

Fixes #3648

[fregante]

Actually this could be an opportunity make it even more useful:

Suggested change

	const actionURL = new URL(`/${getRepoURL(true)}/actions`);
	const actionURL = new URL(getRepoURL('actions'));

• getRepoURL() without argument would be used for API calls, selectors and cache keys
• getRepoURL(path) would be use to generate URLs to user pages.

It could go one step further and accept an extra argument, these would be equivalent

	const actionURL = new URL(getRepoURL('actions'));
	const actionURL = getRepoURL('actions', URL);

Edit: not worth it because there's only one URL built this way.

[fregante]

Done. This makes the function a reverse getRepoPath

URL creation is now less noisy too:

- const url = `/${getRepoURL()}/actions`
+ const url = getRepoURL('actions')

[fregante]

Last thought: should this be split into 2 functions?

function getRepoURL(): string;
function buildRepoURL(...parts: string[]): string;

[yakov116]

At first I thought no, but then I saw your last commit. So 👍