[DOCS] README: reorder sections and rename "Custom resources" to "New resources"

[DOCS] Example Afforestation -> Afforestation/reforestation + Warning case 2 OR relationship between same 'Resource group'

[DOCS] British spelling in README: optimizer → optimiser (conflicts)

[DOCS] Update README for non-dev maintenance

[DOC] README: British spelling (optimization -> optimisation, optimizer -> optimiser)

[DOC] README: fix tab name, add tabs overview, custom resources, scenarios, Case 9, and missing data scripts

[DOC] README: remove inputs_template.xlsx from file reference table

[DOC] Readme up to date

[FIX] No more derived method

[FIX] text

[DOC] Readme updated with instructions on adding data and updating libraries

[DOCS/FIX] First draft of Objective No. 5: TO FACILITATE MAINTENANCE AND UPDATES FOR CG STAFF. (No more hard-coded settings, libraries updated, instructions added to the README)

Update README.md

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