docs(site): fix CLI command docs (#4979)

Also, minor updates for contrib docs

site/content/docs/Contribution guidelines/_index.md

@@ -6,9 +6,10 @@ toc_hide: true
 
 > NOTE: Those guidelines are preliminary and will change as the project grows and expands in scope.
 
-## Contacting Developers
+## Code Documentation
 
-* Using [Slack](https://slack.kopia.io) is the quickest way to get in touch with developers.
+Kopia is primarily written using [The Go Programming Language](https://go.dev/doc/).
+The source code documentation can be found on [godoc.org](https://godoc.org/github.com/kopia/kopia/repo).
 
 ## Submitting issues
 
@@ -35,3 +36,7 @@ toc_hide: true
   - `<description>` is a clear description of a PR.
   - Follow the pattern precisely, as the title-checker cares about capitalization parentheses, and spaces.
   - For example: `feat(cli): Add new policy rule --new-feature-x to enable using feature x`.
+
+## Contacting Community
+
+* Use [Slack](https://slack.kopia.io) to reach out to other developers.

site/content/docs/Reference/Command-Line/_index.md

@@ -1,6 +1,6 @@
 ---
-title: "Command Line"
-linkTitle: "Command Line"
+title: "Command-Line Reference"
+linkTitle: "Command-Line Reference"
 weight: 10
 ---
 

site/content/docs/Reference/Go API/_index.md

@@ -1,9 +0,0 @@
----
-title: "Go API"
-linkTitle: "Go API"
-weight: 1
----
-
-Kopia provides programmatic API for accessing the repository. 
-
-The documentation can be found on [godoc.org](https://godoc.org/github.com/kopia/kopia/repo).

site/content/docs/Reference/_index.md

@@ -1,10 +1,9 @@
 ---
-title: "Command-Line References"
-linkTitle: "Command-Line References"
+title: "Reference"
+linkTitle: "Reference"
 weight: 40
 hide_summary: true
 no_list: true
 ---
 
-* [Go API Reference](go-api/)
 * [Command-Line Reference](command-line/)

tools/cli2md/cli2md.go

@@ -311,8 +311,8 @@ func generateSubcommandPage(fname string, cmd *kingpin.CmdModel) {
 		}
 	}
 
-	fmt.Fprintf(f, "```shell\n$ kopia %v%v%v\n```\n\n", cmd.FullCommand, flagSummary, argSummary) //nolint:errcheck
-	fmt.Fprintf(f, "%v\n\n", escapeFlags(cmd.Help))                                               //nolint:errcheck
+	fmt.Fprintf(f, "```shell\n$ kopia %v%v%v\n```\n\n", cmd.FullCommand, flagSummary.String(), argSummary.String()) //nolint:errcheck
+	fmt.Fprintf(f, "%v\n\n", escapeFlags(cmd.Help))                                                                 //nolint:errcheck
 
 	emitFlags(f, cmd.Flags)
 	emitArgs(f, cmd.Args)