Update submit.txt

[sallybracegirdle]

Made some minor tweaks to the copy, updated and added some links. Also removed what appeared to be a repeated question.

Please check the following:

• [ ] Has the code POD documentation been added or updated?
• [ ] Whether this PR should include changes to any public documentation, or the FAQ;
• [ ] All cobrand-specific commits start their commit message with the cobrand in square brackets;
• [ ] Is new functionality tested? CodeCov will warn you about the diff coverage, but won’t complain about e.g. new files;
• [ ] Will cobrand-specific changes require additional work to ensure consistent behaviour on www.fixmystreet.com?
• [ ] Are the changes tested for accessibility?
• [ ] Have you updated the changelog? If this is not necessary, put square brackets around this: skip changelog

Please check the contributing docs, and describe your pull request here. Screenshots or GIF animations (using e.g. LICEcap) may be helpful.

Please include any issues that are fixed, using "fixes" or "closes" so that they are auto-closed when the PR is merged.

Thanks for contributing!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.64%. Comparing base (129329c) to head (e79655c).

:exclamation: Current head e79655c differs from pull request most recent head 00648c4

Please upload reports for the commit 00648c4 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4998 +/- ## ========================================== - Coverage 75.79% 71.64% -4.16% ========================================== Files 351 393 +42 Lines 25677 30814 +5137 Branches 4880 4892 +12 ========================================== + Hits 19463 22077 +2614 - Misses 4691 7294 +2603 + Partials 1523 1443 -80 ```

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